Question

The 7^th term of an AP is -1 and its 16^th term is 17. The nth term of the AP is

(a) (3n + 8) 

(b) (4n – 7) 

(c) (15 – 2n) 

(d) (2n – 15)

Answer 1

Correct answer is (d) (2n – 15)

Let a be the first term and d be the common difference of the AP. Then,

nth term of the AP, a_n = a + (n - 1)d

Now,