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The sum of the first n even, positive integers is 2 + 4 + 6 + · · ... ...

The sum of the first n even, positive integers is 2 + 4 + 6 + · · · + 2n is n(n + 1). What is the sum of the first 20 even, positive integers?
(A)    120
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Math - Problem Set Y: Sequences & Series

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The sum of the first n even, positive integers is 2 + 4 + 6 + · · ... ... 
Posted: 06/27/2015 15:05
Please explain why we put n=20.Thank you
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Posted: 06/27/2015 22:27
Hi Munir,

The problem is asking for 'the sum of the first 20 even, positive integers' and the problem states that the formula returns 'the sum of the first n even, positive integers,' so we choose n to be 20.

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