5. If {an} is a G.S. (i.e., geometric sequence) anda = 4, r = 5, find – InterviewSolution

1.

5. If {an} is a G.S. (i.e., geometric sequence) anda = 4, r = 5, find ag and So.

Answer»

Givena1 = 4, r = 5

Then, a6 = a1*r^5 = 4*(5)^5a6 = 4*3125 = 12500

S6 = a1(r^n - 1)/(r - 1) = 4*(5^6 - 1)/4 = 15625 - 1 = 15624

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