Mathematics
The first term of an A.P. is 7 and its 13th term is 35. The common difference of the A.P. is :
AP
2 Likes
Answer
Given,
a = 7
⇒ a13 = 35
⇒ a + (13 - 1)d = 35
⇒ 7 + 12d = 35
⇒ 12d = 35 - 7
⇒ 12d = 28
⇒ d =
⇒ d = .
Hence, option 4 is the correct option.
Answered By
3 Likes
Related Questions
The 7th term of an A.P. is 4 and its common difference is −4. The first term of the A.P. is :
32
28
24
36
The sum of first n terms of an A.P. is (4n2 + 2n). The nth term of the A.P. is :
(6n − 2)
(8n − 2)
(6n + 2)
(8n + 2)
There are total 9 terms in an A.P. If the last term and the sum of all the terms are 28 and 144 respectively, then the first term is :
1
7
4
5
The 5th term of an A.P. is −3 and its common difference is −4. The sum of its first 10 terms is :
−50
−40
−60
−30