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What is ∑n=16[4(−5)n−1] equal to?
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What is ∑n=16[4(−5)n−1] equal to?

User Whenov
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1 Answer

11 votes

Answer:

This will be the sum of a geometric series where the first term is 4

The common ratio is -5

And we will have 6 terms.....so....the sum is

first term [ 1 - common ratio^number of terms ] / [ 1 - common ratio ] =

4 [1 - (-5)^6] / [ 1 - -5 ] =

4 [ 1 - 15625 ] / 6 =

(2/3) ( -15624 ) =

-10416

Explanation:

User Dpdearing
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