Aptitude | Progressions | Question 7

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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