Question

Find the sum of the geometric series with a1 = 7, r = 2, And n = 14

Answer 1

we know that
a1=7
r=2
n=14
then
Sn=a1*[(r^n)-1]/(r-1)-------------->S14= 7*[(2^14)-1]/(2-1)=114681

the answer is 114681