# What the sum of the numbers from 1-200?

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#### Explanation

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#### Explanation:

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48
Jan 24, 2016

$200 \times \frac{1 + 200}{2} = 20100$

#### Explanation:

The sum of a finite arithmetic sequence is equal to the count of the number of terms multiplied by the average of the first and last terms.

In our case there are $200$ terms with average value $\frac{1 + 200}{2}$

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