【GMAT考满分数学PS题库】The sum, s, of consecutive integers from 1 to n is_真题_答案_解析 GMAT考满分官网

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题目内容

The sum, s, of consecutive integers from 1 to n is given by the formula $${s}={n}\frac{(n+1)}{2}$$. What is the value of the sum if it is three times as large as the number of integers summed?

A10
B12
C13
D14
E15

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正确答案: E

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