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If the sum of the first n positive integers is S, what is

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Joined: 05 Jul 2006
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If the sum of the first n positive integers is S, what is [#permalink]

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05 Oct 2006, 13:03
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If the sum of the first n positive integers is S, what is the sum of the first n positive even integers, in terms of S ?
(A)
(B) S
(C) 2S
(D) 2S + 2
(E) 4S
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05 Oct 2006, 14:11
If the sum of the first n positive integers is S, what is the sum of the first n positive even integers, in terms of S ?
(A)
(B) S
(C) 2S
(D) 2S + 2
(E) 4S

(n-1)n/2 = s

2s = n^2 -n = sum of even

Edited after revising my books for the sum of the first n even and n odd positive intigers

even = n^2 -n

odd = n^2

Last edited by yezz on 05 Oct 2006, 15:18, edited 1 time in total.
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Joined: 23 Jun 2005
Posts: 841
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06 Oct 2006, 08:38
By plugging in,

C) 2S
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06 Oct 2006, 08:50
One more for C.

If n=5 then S=15 and first 5 even integers is 30 so 2(s).
06 Oct 2006, 08:50
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