Question

What is the sum of the first six terms of the geometric series?
2-6+18-54+

Answer 1

Answer: -364

Step-by-step explanation:

This is a geometric sequence with first term 2, common ratio -3, and 6 terms.

$S_{6}=\frac{2(1-(-3)^{6}}{1-(-3)}=\boxed{-364}$