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If n>0 and r is the remainder then (n-1)*(n+1)/24 what is

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If n>0 and r is the remainder then (n-1)*(n+1)/24 what is [#permalink] New post 09 Sep 2007, 04:20
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If n>0 and r is the remainder then (n-1)*(n+1)/24 what is the value of r?

1) 2 is not a factor of n
2) 3 is not a factor of n


I still haven't found the way to solve this one, anyone?
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 [#permalink] New post 09 Sep 2007, 05:11
C, r=0
start with 5 for example.
since denominator 24 = 2^3*3, starting with n=5, there always be 2^3 and 3 in the numerator, so r=0
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 [#permalink] New post 09 Sep 2007, 06:42
CaspAreaGuy wrote:
C, r=0
start with 5 for example.
since denominator 24 = 2^3*3, starting with n=5, there always be 2^3 and 3 in the numerator, so r=0


Shame on me it's quite easy... I do not know why I couldn't see that!

Thanks
  [#permalink] 09 Sep 2007, 06:42
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If n>0 and r is the remainder then (n-1)*(n+1)/24 what is

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