Question

In a G. P., the last term is 1024 and the common ratio is 2. Its 20 th term from the end is ______

(A) 1/512

(B) 1/1024

(C) 1/256

(D) 512

Answer 1

The correct option is (A) 1/512.

Explanation:

If the G.P. is a, ar, ar² , ....... l/r, then 2 1, 1/r, 1/r² ....... , ar², ar, a is also G.P. with first term l = 1024 and common ratio of this G.P. is 1/r = 1/2