Question

If an AP, if d = - 4n = 7,a,, = 4, then a is
equal to :
(A) 6
(B) 7
(C) 20
(D) 28​

Answer 1

Step-by-step explanation:

(d) In an AP, an = a + (n-1)d

⇒ 4 = a + (7-1)(-4) [by given conditions]

⇒ 4 = a + 6(-4)

⇒ 4 + 24 = a

∴ a = 28