Find the sum of the geometric sequence -1, 6, -36, ... if there are 7 terms

sbrigynt7b

sbrigynt7b

Answered question

2022-11-15

Find the sum of the geometric sequence -1, 6, -36, ... if there are 7 terms

Answer & Explanation

siriceboynu1

siriceboynu1

Beginner2022-11-16Added 12 answers

In this sequence we have: a 1 = - 1 , q = - 6 , n = 7 . If we apply the formula for S n we get:
S 7 = ( - 1 ) 1 - ( - 6 ) 7 1 - ( - 6 )
S 7 = ( - 1 ) 1 + 279936 7
S 7 = - 39991

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