Given that n is an integer, is n 1 divisible by 3? (1) n^2+n : DS Archive
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# Given that n is an integer, is n 1 divisible by 3? (1) n^2+n

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Given that n is an integer, is n 1 divisible by 3? (1) n^2+n [#permalink]

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19 Sep 2007, 12:28
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Given that n is an integer, is n — 1 divisible by 3?
(1) n^2+n is not divisible by 3
(2)3n+5>=k+8 , where k is a positive multiple of 3
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19 Sep 2007, 12:50
12345678 wrote:
Given that n is an integer, is n — 1 divisible by 3?
(1) n^2+n is not divisible by 3
(2)3n+5>=k+8 , where k is a positive multiple of 3

Its A
Stmtn 1 .
n(n+1) is not divisible by 3 . Means neither n nor n+1 is divisible by 3.
That definitely means n-1 is divisble by 3.
You take any number for n and n+1 that is not divisible by 3. You will find n-1 is divisible by 3.

Stmtn2
3n -3 >= k
3(n-1) <= 3a ---> n-1 <= 1 . Takes you no where.
Re: DS   [#permalink] 19 Sep 2007, 12:50
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