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8 December, 13:31

The sum of the first 100 positive integers is 5,050. What is the sum of the first 200 positive integers?

A. 10,000B. 10,200C. 15,050D. 20,050E. 20,100

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  1. 8 December, 14:49
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    The sum of the k for k=1 to k="n" = (n * (n+1)) / 2, where "n" is the total integer.

    In this problem n = 200

    Sum = (200*201) / 2 = 20,100
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