Find the sum of the first 10 terms of the sequence: -4, -12, -36, -108

Question

a) -2,040

b) -118,096

c) -39,364

d) -59,048

Answer 1

Figuring out the formula was quick trial and error, but the sequence is ∑(-4(3^x-1), x= 1 to 10.

= b)

a) -2,040

b) -118,096

c) -39,364

d) -59,048