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zepelin [54]
4 years ago
14

PLEASE PLEASE PLEASE HELP I NEED IT What is the sum of the series?

Mathematics
1 answer:
JulsSmile [24]4 years ago
7 0
Formula :

n\left(a_1+\frac{d\left(n-1\right)}{2}\right)

Plug in the values :

20\left(1+\frac{-3\left(20-1\right)}{2}\right) = 550

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Answer:550
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