OG12 #82

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OG12 #82

by jimmynicho » Fri Jun 19, 2009 1:34 pm
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If n is an interger greater than 6, which of the following must be divisible by 3?

a) n(n+1)(n+4)
b)n((n+2)(n-1)
c)n(n+3)(n-5)
d)n(N+4)(n-2)
E)n(n+5)(n-6)

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Re: OG12 #82

by dtweah » Fri Jun 19, 2009 2:38 pm
jimmynicho wrote:Is there a shortcut to this question? - Thanks

If n is an interger greater than 6, which of the following must be divisible by 3?

a) n(n+1)(n+4)
b)n((n+2)(n-1)
c)n(n+3)(n-5)
d)n(N+4)(n-2)
E)n(n+5)(n-6)
Making n= 7 and 8 leaves no one expression that is consistently divisible by 3. So I dont' see how any can meet the "MUST" requirement.