Question

What is the sum of the geometric sequence –3, 18, –108, … if there are 8 terms?

Answer 1

so the answer would be what

Answer 2

that was the 18th term
and I think you would like to add all the terms?

Answer 3

the nth term

3*(-6)^17 = -50779978334208

Answer 4

not nth but 18th term

Answer 5

the sum will be

3*(-6)^0 + 3*(-6)^1 + 3*(-6)2........... 3(-6)^17

=> 3{ \[3{ \sum_{i=0}^{17}(-6)^{i}}\]

Answer 6

choices to chose from
719,835

119,973

–119,973

–719,835

Answer 7

since the odd ones will have negative values they should reduce the values. Let me check the final summation given the above formula.

Answer 8

ok

Answer 9

what would be the final summation