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BSEB Class 10 Maths Chapter 5 Arithmetic Progressions Ex 5.2 Textbook Solutions PDF: Download Bihar Board STD 10th Maths Chapter 5 Arithmetic Progressions Ex 5.2 Book Answers

BSEB Class 10 Maths Chapter 5 Arithmetic Progressions Ex 5.2 Textbook Solutions PDF: Download Bihar Board STD 10th Maths Chapter 5 Arithmetic Progressions Ex 5.2 Book Answers
BSEB Class 10 Maths Chapter 5 Arithmetic Progressions Ex 5.2 Textbook Solutions PDF: Download Bihar Board STD 10th Maths Chapter 5 Arithmetic Progressions Ex 5.2 Book Answers


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Bihar Board Class 10th Maths Chapter 5 Arithmetic Progressions Ex 5.2 Textbooks Solutions PDF

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Bihar Board Class 10th Maths Chapter 5 Arithmetic Progressions Ex 5.2 Books Solutions

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BSEB Bihar Board Class 10th Maths Solutions Chapter 5 Arithmetic Progressions Ex 5.2

Question 1.
Fill in the blanks in the following table, given that a is the first term, d the common difference and an the nth term of the AP:

Solution:
Blanks may be filled as under:
(i) an – a + (n – 1)d = 7 + (8 – 1)3
= 7 + 7 × 3 = 7 + 21 = 28

(ii) an = a + (n – 1)d So, 0 = – 18 + (10 – 1)d
or 18 = 9d or d = 189 = 2

(iii) an = a + (n – 1)d So, – 5 = a + (18 – 1)(- 3)
or – 5 = a + 17(- 3) or – 5 = a – 51
or a = – 5 + 51 = 46

(iv) an = a + (n – 1)d So, 3.6 = – 18.9 + (n – 1)25
or 3.6 + 18.9 = (n – 1)2.5 or 22.5 = (n – 1)2.5
or n – 1 = 22.52.5 or n – 1 = 9
or n = 9 + 1 = 10

(v) an = a + (n – 1)d = 3.5 + (105 – 1) × 0
= 3.5 + 0 = 3.5

Question 2.
Choose the correct choice in the following and justify:
(i) 30th term of the 10, 7, 4, ………………. is
(A) 97
(B) 77
(C) – 77
(D) – 87

(ii) 10th term of the – 3, – 12 + 3 = −1+62 = 52 and n = 11.
We know that an = a + (n – 1)d
∴ a11 = – 3 + (11 – 1)52
= – 3 + 10 × 52 = – 3 + 25 = 22
So, (B) is the correct choice.

Question 3.
In the following APs, find the missing terms in the boxes:
(i) 2, , 26

(ii)
, 13, , 3
(iii) 5, , 912
(iv) – 4, , 6
(v) , 38, , – 22.
Solution:
(i) Let 2,  and 26 be a, (a + d) and (a + 2d) respectively.
∴ a = 2 and a + 2d = 26
So, 2 + 2d = 26 or 2d = 26 – 2 = 24
or d = 242 = 12
Thus, the missing term = a + d = 2 + 12 = 14.

(ii) Let , 13,  and 3 be a, a + d, a + 2d and a + 3d respectively.
∴ a + d = 13 ……………. (1)
and a + 3d = 3 ……………. (2)
So, (2) – (1) gives 2d = – 10 or d = – 5
Putting d = – 5 in (1), we get
a – 5 = 13 or a = 13 + 5 = 18
∴ The missing terms are a, i.e., 18
and a + 2d, i.e., 18 + 2(- 5) = 18 – 10 = 8.

(iii) Let 5,  and 912 be a, a + d, a + 2d and a + 3d respectively.
∴ a = 5
 and a + 2d, i.e; 5 + 2 × 32 = 5 + 3 = 8.

(iv) Let – 4, , and 6 be a, a + d, a + 2d, a + 3d, a + 4d and a + 5d respectively.
∴ a = – 4 ………………. (1)
and a + 5d = 6 ……………… (2)
So, (2) – (1) gives 5d = 10 or d = 2
The missing terms are
a + d = – 4 + 2 = – 2,
a + 2d = – 4 + 2 × 2 = – 4 + 4 = 0,
a + 3d = – 4 + 3 × 2 = – 4 + 6 = 2,
and a + 4d = – 4 + 4 × 2 = – 4 + 8 = 4.

(v) Let , 38,  and – 22 be a, a + d, a + 2d, a + 3d, a + 4d and a + 5d respectively.
∴ a + d = 38 ……….. (1)
and a + 5d = – 22 ……………. (2)
So, (2) – (1) gives 4d = – 60 or d = – 15
Putting d = – 15 in (1), we get
a – 15 = 38 or a = 38 + 15 = 53
∴ The missing terms are a, i.e., 53,
a + 2d, i.e., 53 + 2 × (- 15) = 53 – 30 = 23,
a + 3d, i.e., 53 + 3 × (- 15) = 53 – 45 = 8,
and a + 4d, i.e., 53 + 4 × (- 15) = 53 – 60 = – 7

Question 4.
Which term of the AP: 3, 8, 13, 18, …, is 78?
Solution:
We have:
a = 3, d = 8 – 3 – 5.
Let 78 be the nth term of the given AP. Then,
an = 78 or a + (n – 1 )d = 78
∴ 3 + (n – 1)5 = 78 or (n – 1)5 = 78 – 3
or 5(n – 1) = 75 or n – 1 = 15
or n = 15 + 1 i.e., n = 16
Thus, 78 is the 16th term of the given AP.

Question 5.
Find the number of terms in each of the following APs:
(i) 7, 13, 19, ………………., 205
(ii) 18, 1512, 13, ………………, – 47
Solution:
(i) Clearly, it forms an AP with first term a – 3 and common difference d = 13 – 7 = 6.
Let there be n terms in the given AP.
Then, nth term = 205.
So, a + (n – 1)d = 205 or 7 + (n – 1)6 = 205
or 6(n – 1) = 205 – 7 or 6(n – 1) = 198
or n – 1 = 1986 = 33 or n = 33 + 1 = 34
Thus, the given AP contains 34 terms.

(ii) Let there be n terms in the given AP.
18, 15 12, 13, …, – 47. Clearly, it forms an AP with first term a = 18 and common difference d = 1512 – 18 = 312 – 18 = 31−362 = −52. Then, nth term = – 47.
So, a + (n – 1)d = – 47 or 18 + (n – 1)(- 52) = – 47
or (- 52) (n – 1) = – 47 – 18 = – 65
or n – 1 = – 65 × −25 = – 13 × (- 2) = 26
Thus, there are 27 terms in the given AP.

Question 6.
Check whether – 150 is a term of the AP: 11, 8, 5, 2, …
Solution:
Here, a2 – a1 = 8 – 11 = – 3
a3 – a2 = 5 – 8 = – 3
a4 – a3 = 2 – 5 = – 3
As an+1 – an is same every time, so the given list of numbers is an AP.
Now, a = 11, d = – 3.
Let – 150 be the nth term of the given AP.
we know that an = a + (n – 1)d
So, – 150 = 11 + (n – 1)(- 3)
or – 3(n – 1) = – 150 – 11 = – 161
or n – 1 = 1613 or n = 1613 + 1 = 1643
But n should be a positive integer. So, our assumption was wrong and so – 150 is not a term of the given AP.

Question 7.
Find the 31st term of an AP whose 10th term is 38 and the 16th term is 73.
Solution:
Let a be the first term and d be the common difference of AP.
Now, an = a + (n – 1)d
∴ a11 = a + 10d = 38 …………….. (1)
and a16 = a + 15d = 73 …………….. (2)
Subtracting (1) from (2), we get
5d = 35 or d = 355 = 7
and then from (1),
a + 10 × 7 = 38
or a = 38 – 70 = – 32
∴ a31 = a + 30d = – 32 + 30 × 7
= – 32 + 210 = 178

Question 8.
An AP consists of 50 terms of which 3rd term is 12 and the last term is 106. Find the 29th term.
Solution:
Let a be the first term and d be the common difference of AP.
Now, an = a + (n – 1)d
∴ a3 = a + 2d = 12 …………… (1)
and a50 = a + 49d = 106 …………….. (2)
Subtracting (1) from (2), we get
47d = 94 or d = 9447 = 2
and then from (1),
a + 2 × 2 = 12 or a = 12 – 4 = 8
∴ a29 = a + 28d = 8 + 28 × 2
= 8 + 56 = 64

Question 9.
If the 3rd and 9th terms of an AP are 4 and – 8 respectively, which term of this AP is 0?
Solution:
Let a be the first term and d be the common difference of AP.
a3 = a + 2d = 4 ………….. (1)
a9 = a + 8d = – 8 ………….. (2)
Subtracting (1) from (2), we get
6d = – 12 or d = −126 = – 2
and then from (1),
a + 2 × (- 2) = 4 or a + 4 + 4 = 8
Let an = 0, So, a + (n – 1)d = 0
or 8 + (n – 1)(- 2) = 0 or (n – 1)(- 2) = – 8
or n – 1 = −8−2 = 4 or n = 4 + 1 = 5
Thus, 5th term of the AP is 0.

Question 10.
The 17th term of an AP exceeds its 10th term by 7. Find the common difference.
Solution:
Let a be the first term and d be the common difference of AP.
It is given that a17 – a10 = 7 or (a + 16d) – (a + 9d) = 7
or 7d = 7 or d = 1
Thus, the common difference is 1.

Question 11.
Which term of the AP : 3, 15, 27, 39, … will be 132 more than its 54th term?
Solution:
Here, a = 3, d = 15 – 3 = 12. Then,
a54 = a + 53d = 3 + 53 × 12
= 3 + 636 = 639
Let an be 132 more than its 54th term
i.e., an = a54 + 132 = 639 + 132 = 771
So, a + (n – 1)d = 771 or 3 + (n – 1)12 = 771
or 12(n – 1) = 771 – 3 or 12(n – 1) = 768
or n – 1 = 76812 = 64 or n = 64 + 1 = 65
Thus, 65th term of the AP is 132 more than its 54th term.

Question 12.
Two APs have the same common difference. The difference between their 100th terms is 100, what is the difference between their 1000th terms?
Solution:
Let the two APs be a1, a2, a3, …………… an, …………. and b1, b2, b3, …………, bn, ………….
Also, let d be the common difference of each of the two APs. Then,
an = a1 + (n – 1 )d and bn = b1 + (n – 1)d
or an – bn = [a1 + (n – 1)d] – [b1 + (n – 1)d]
or an – bn = a1 – b1 for all natural numbers n
or a100 – b100 = a1 – b1 = 100 [Given]
Now, a1000 – b1000 = a1 – b1
So, a1000 – b1000 = 100 [∵ a1 – b1 = 100]
Hence, the difference between 1000th terms is the same as the difference between 100th terms, i.e., 100.

Question 13.
How many three-digit numbers are divisible by 7?
Solution:
105 is the first three-digit number divisible by 7 and 994 is the last 3-digit number divisible by 7. Thus, we have to determine the number of terms in the list 105, 112, 119, …, 994.
Clearly, it forms an AP with first term a = 105
and common difference d = 112 – 105 = 7.
Let there be n terms in the AP. Then, nth term = 994.
As an = a + (n – 1)d, therefore
105 + (n – 1)7 = 994 or 7(n – 1) = 994 – 105
or 7(n – 1) = 889 or n – 1 = 8897 = 127
or n = 127 + 1 = 128
Hence, there are 128 numbers of three digit which are divisible by 7.

Question 14.
How many multiples of 4 lie between 10 and 250?
Solution:
We observe that 12 is the first natural number between 10 and 250, which is a multiple of 4 (i.e., divisible by 4).
Also, when we divide 250 by 4, the remainder is 2. Therefore, 250 – 2 = 248 is the largest natural number divisible by 4 (i.e., multiple of 4) and lying between 10 and 250.
Thus, we haye to find the number of terms in an AP with first term = 12, last term = 248, and common difference = 4 (as the numbers are divisible by 4).
Let there be n terms in the AP. Then
an = 248 So, 12 + (n – 1)4 = 248
or 4(n – 1) = 248 – 12 or 4(n – 1) = 236
or n – 1 = 2364 = 59 or n = 59 + 1 = 60
Hence, there are 60 multiples of 4 between 10 and 250.

Question 15.
For what value of n, are the nth terms of the APs: 63, 65, 67, … and 3, 10, 17, … are equal?
Solution:
If nth terms of the APs 63, 65, 67, … and 3, 10, 17, … are equal, then
63 + (n – 1)2 = 3 + (n – 1)7
[∵ In 1st AP, a = 63, d = 65 – 63 = 2 and in 2nd AP, a = 3, d = 10 – 3 = 7]
or 7(n – 1) – 2(n – 1) = 63 – 3 or (n – 1)(7 – 2) = 60
or 5(n – 1) = 60 or n – 1 = 605 = 12
or n = 12 + 1 = 13
Hence, the 13th terms of the two given APs are equal.

Question 16.
Determine the AP whose third term is 16 and the 7th term exceeds the 5th term by 12.
Solution:
Let a be the first term and d be the common difference of AP.
Here, a3 = 16 and a7 – a5 = 12
So, a + 2d = 16 ……….. (1)
and (a + 6d) – (a + 4d) = 12 or 2d = 12
or d = 6 ……………. (2)
Using (2) in (1), we get
a + 2 × 6 = 16. or a = 16 – 12 = 4
Thus, the required AP is 4, 4 + 6, 4 + 2 × 6, 4 + 3 × 6, … i.e., 4, 10, 16, 22, ……

Question 17.
Find the 20th term from the last term of the AP: 3, 8, 13, ………….. 253.
Solution:
We have:
l = Last term = 253
and d = Common difference = 8 – 3 = 5
∴ 20th term from the end = l – (20 – 1)d = l – 19d
= 253 – 19 × 5
= 253 – 95 = 158

Question 18.
The sum of the 4th and 8th terms of an AP is 24 and the sum of the 6th and 10th terms is 44. Find the first three terms of the AP.
Solution:
Let a be the first term and d be the common difference of AP.
Here, a4 + a8 = 24 or (a + 3d) + (a + 7d) = 24
or 2a + 10d = 24 or a + 5d = 12 ……….. (1)
and a6 + a10 = 44 or (a + 5d) + (a + 9d) = 44
or 2a + 14d = 44 or a + 7d = 22 ……… (2)
Subtracting (1) from (2), we get
2d = 10 or d = 5
and then from (1),
a + 25 = 12 or a = – 13
The first three terms are a, (a + d) and (a + 2d)
Putting values of a and d, we get – 13, (- 13 + 5) and (- 13 + 2 × 5)
i.e., – 13, – 8 and – 3.

Question 19.
Subba Rao started work in 1995 at an annual salary of Rs 5000 and received an increment of Rs 200 each year. In which year did his income reach Rs 7000?
Solution:
The annual salaries drawn by Subba Rao in the years 1995, 1996, 1997, etc. are Rs 5000, Rs 5200, Rs 5400, …, Rs 7000.
The list of these numbers is 5000, 5200, 5400, …, 7000.
It forms an AP. [∵ a2 – a1 = a3 – a2 = 200]
Let an = 7000
So, 7000 = a + (n – 1)d
or 7000 = 5000 + (n – 1)(200)
or 200(n – 1) = 7000 – 5000
or n – 1 = 2000200 = 10 or n = 10 + 1 = 11
Thus, in the 10th year (i.e., in 2005) of his service, Subba Rao drew an annual salary of Rs 7000.

Question 20.
Ramkali saves Rs 5 in the first week of a year and then increased her weekly savings by Rs 1.75. If in the nth week, her weekly savings become Rs 20.75, find n.
Solution:
Ramkali’s savings in the subsequent weeks are respectively Rs 5, Rs 5 + Rs 1.75, Rs 5 + 2 × Rs 1.75, Rs 5 + 3 × Rs 1.75, …
And in the nth week her savings will be Rs 5 + (n – 1) × Rs 1.75
or 5 + (n – 1) × 1.75 = 20.75
or (n – 1) × 1.75 = 20.75 – 5 = 15.75
∴ n – 1 = 15.751.75 = 9
or n = 9 + 1 = 10


BSEB Textbook Solutions PDF for Class 10th


Bihar Board Class 10th Maths Chapter 5 Arithmetic Progressions Ex 5.2 Textbooks for Exam Preparations

Bihar Board Class 10th Maths Chapter 5 Arithmetic Progressions Ex 5.2 Textbook Solutions can be of great help in your Bihar Board Class 10th Maths Chapter 5 Arithmetic Progressions Ex 5.2 exam preparation. The BSEB STD 10th Maths Chapter 5 Arithmetic Progressions Ex 5.2 Textbooks study material, used with the English medium textbooks, can help you complete the entire Class 10th Maths Chapter 5 Arithmetic Progressions Ex 5.2 Books State Board syllabus with maximum efficiency.

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