The nth term of an AP is 7n

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Solution

Q.
The nth term of an AP is $7 n + 4 .$ The common difference is:

1 7n

2 4

3 7

4 1

Ans.
(3)

$W e h a v e, a_{n} = 7 n + 4 \Rightarrow a_{n - 1} = 7 (n - 1) + 4 = 7 n - 3 \Rightarrow C o m m o n d i f f e r e n c e, d = a_{n} - a_{n - 1} = (7 n + 4) - (7 n - 3) = 7$

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