Question

Sum of series 1+3+9+27....is 364. The number of terms is?​

Answer 1

Sn = a(r^n -1)/(r-1)

where ,Sn = 364 ,

a = 1

r = 3

so, 364 = 1(3^n -1)/(3-1)

= 364 × 2 = 3^n -1

= 728 +1 = 3^ n = 729

= 3^n = 3^ 6

hence, n = 6

Answer 2

Step-by-step explanation:

n = 6

answer is 6.

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