What is the sum of the geometric sequence −1, 6, −36, … if there are 7 terms?

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What is the sum of the geometric sequence −1, 6, −36, … if there are 7 terms?

Mathematics
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first work out the common ratio = second term / first term
ok so would that be 6?
6 / -1 = -6

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Yes, sorry :)
then use the formula for sum of n terms Sn = a1 * (1 - r^n) ---------- 1 - r where a1 = first term and r = common ratio, n = number of terms
Hmm then you would plug that in to get -39,991?

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