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01-04-2018
Mathematics

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PLEASE PLEASE PLEASE HELP I NEED IT

What is the sum of the series?

PLEASE PLEASE PLEASE HELP I NEED IT What is the sum of the series class=

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Аноним Аноним

01-04-2018

Formula :

[tex]n\left(a_1+\frac{d\left(n-1\right)}{2}\right)[/tex]

Plug in the values :

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

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Answer:550
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