Question

What is the sum of the geometric series?

If you could explain how to solve it, that would help me a lot

Answer 1

The number above the sum sign is the number of terms in the series, so 5.

The n=1 below the sum sign, means the series starts at 1

Replace n with values from 1 to 5 and then add them together:

4(2)^1 = 8

4(2)^2 = 16

4(2)^3 = 32

4(2)^4 = 64

4(2)^5 = 128

Sum = 8 + 16 + 32 + 64 + 128 = 248