Question

What is the first 6 terms of this geometric sequence? 1, 8, 64, 512,

a. 1024
b. 4096
c. 32768
d. 37449

Answer 1

is D. 37449

Explanation:

Use the formula. Sn=a1(1−r^n) / 1−r, Where a1 is the first term (1 in this case), r is 8, and n is the number of terms. So (n)=1(1-8^6)/(1-8)=37449

Answer 2

B: 4096 then C: 32768