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divide k evenly

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by rainbownlife » Fri Jun 13, 2008 3:01 pm
If k=m(m+4)(m+5) k and m are positive integers. Which of the following could divide k evenly?

I.3 II.4 III.6


I think all three could divide k evenly.
OA posted is 3,6 only. Not sure about the correctness of the OA....
if m=3 , 4 cud divide the expression? I would understand ans =3,6 , if question asked MUST divide. Any thoughts...?
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by netigen » Fri Jun 13, 2008 3:12 pm
3 and 6 will divide

so Ans is I and III

Why four wont divide E.g. m=5 k= 5x6x7
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Re: divide k evenly

by Ian Stewart » Sat Jun 14, 2008 1:44 am
rainbownlife wrote:If k=m(m+4)(m+5) k and m are positive integers. Which of the following could divide k evenly?

I.3 II.4 III.6


I think all three could divide k evenly.
OA posted is 3,6 only. Not sure about the correctness of the OA....
if m=3 , 4 cud divide the expression? I would understand ans =3,6 , if question asked MUST divide. Any thoughts...?
You're completely right. Anything could divide k here. The word 'could' should read 'must', surely. Where is the question from?
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by rainbownlife » Sat Jun 14, 2008 11:15 am
thanks Ian

somebody compiled a list of questions from gmatprep. Found this question in that list. OA was given as 3,6.
May be it is a typo ...'could' instead of 'must'.
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