2 years ago

Ben has a cellphone plan where he pays $12 per

Mathematics

1 answer:

Vlada [557]2 years ago

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Answer:

Step-by-step explanation:

I have done the work before

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Answer:

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Step-by-step explanation:

Given expression : $\sum_{n=3}^{20}(n(n+1))$

Solving further :

$\Rightarrow \sum_{n=3}^{20}(n^2+n)$

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