Find the sum of the geometrical equation -3 , 18 , -108 , if there are 7 terms

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Rashawnsf Rashawnsf

22-12-2018
Mathematics

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Find the sum of the geometrical equation -3 , 18 , -108 , if there are 7 terms

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lily07182008 lily07182008 · Answer 1 · 2018-12-22T05:13:47+01:00

lily07182008 lily07182008

22-12-2018

Answer:

S7=−39991

Explanation:

In this sequence we have: a1=−1, q=−6, n=7. If we apply the formula for Sn we get:

S7=(−1)⋅1−(−6)71−(−6)

S7=(−1)⋅1+2799367

S7=−39991

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