For the geometric sequence 1, b, b2, b3, ... , simplify bS6−S6=

Question

This problem is math 101 problem

Answer 1

sn = a1(r^n -1)/(r-1)

where a1 = 1, r = b, n=6

s6= (b^6 -1)/(b-1)

bs6-s6= s6(b-1) =b^6 -1

if, for example, b=2, then

2^6-1=64-1 = 63