Calvin learns summation!

Algebra Level 2

1−3+5−7+9−11+13−15+…1-3+5-7+9-11+13-15 + \ldots

Once Calvin learnt how to find sum of numbers from 1 to 100. So the curious calvin thought of alternating the signs in the summation as shown below. Find the value of first 100 terms in the summation above.

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Nitesh Chaudhary by Nitesh Chaudhary
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