What is the sum of the geometric sequence-1 6 - 36 yes there are 7 terms

-39991'

Step-by-step explanation:

We require the sum of 7 terms of the G. S. - 1, 6, - 36 ...

The common ratio r = 6/-1 = - 6 and the first term = - 1.

Sum of n terms = a1. (r^n - 1) / (r - 1)

Sum of 7 terms = - 1 * (-6) ^7 - 1) / (-6 - 1)

= - 1 * 39991

= - 39991 (answer).

-39991 is the awnser