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
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Given,
a7 = 4
d = -4
n = 7
We know that,
⇒ an = a + (n - 1)d
⇒ a7 = a + (7 - 1)(-4)
⇒ 4 = a + (6)(-4)
⇒ 4 = a - 24
⇒ 24 + 4 = a
⇒ a = 28.
Hence, option 2 is the correct option.
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The sum of first 40 positive integers divisible by 6 is :
2460
3640
4920
4860
The sum of first 30 odd natural numbers is:
800
900
729
1249
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)