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If the sum of the first n positive integers is equal

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If the sum of the first n positive integers is equal [#permalink]  15 Jun 2018, 08:48
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100% (00:39) correct 0% (00:00) wrong based on 12 sessions
If the sum of the first $$n$$ positive integers is equal $$\frac{n(n + 1)}{2}$$, then the sum of the first 25 positive integers is

A. 51

B. 52

C. 313

D. 325

E. 326
[Reveal] Spoiler: OA

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Re: If the sum of the first n positive integers is equal [#permalink]  16 Jun 2018, 07:01
Carcass wrote:
If the sum of the first $$n$$ positive integers is equal $$\frac{n(n + 1)}{2}$$, then the sum of the first 25 positive integers is

A. 51

B. 52

C. 313

D. 325

E. 326

Sub n = 25, then 25*26/ 2 =? 325.

D.
Re: If the sum of the first n positive integers is equal   [#permalink] 16 Jun 2018, 07:01
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