Question

In an AP, if d = –4, n = 7, a_n = 4, then a is

(A) 6 (B) 7 (C) 20 (D) 28

Answer 1

(D) 28

Explanation:

We know that nth term of an AP is

a_{n =} a + (n – 1)d

where,

a = first term

a_n is nth term

d is the common difference

According to the question,

4 = a + (7 – 1)(- 4)

4 = a – 24

a = 24 + 4 = 28