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Aptitude | Progressions | Question 7

  • Difficulty Level : Basic
  • Last Updated : 16 Sep, 2021

Find the sum of series: 1, 3, 9, 27, 81, …………..39
(A) \[(1-3^10)]/(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)


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