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## Ambition 2 years ago Write the sum using summation notation, assuming the suggested pattern continues. 8 - 40 + 200 - 1000 + ...

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1. Hoa

Sum (from n=1 to infinitive) (-1)^(n+1)* 8* 5^ (n-1)

2. Hoa

|dw:1365198186404:dw|

3. Hoa

that's what I got. hope this helps :)

4. kropot72

$S _{\infty}=\int\limits_{n=1}^{\infty}8\times (-5)^{n-1}$

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