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

Question

asked Jun 12, 2018 110k views

1 Answer

Anton Kastritskiy · Answer 1 · 2018-06-16T01:30:38+0000

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 1(1-8^6) / 1-8