Aptitude | Progressions | Question 7

Find the sum of series: 1, 3, 9, 27, 81, …………..39
(A) [(1-310)]/(1-3)
(B) 18
(C) 10
(D) 20


Answer: (A)

Explanation: Sol: Sn=[a(1-rn)]/(1-r)
=[1(1-310)]/(1-3)
=[(1-310)]/(1-3)


Quiz of this Question
Please comment below if you find anything wrong in the above post

My Personal Notes arrow_drop_up