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Remainder problem

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Remainder problem

by billzhao » Sat Feb 21, 2009 7:33 pm
If n is a positive integer and r is the remainder when (n-1)(n+1) is divided by 24, what is the value of r?

(1) r is not divisible by 2
(2) r is not divisible by 3

Appreciate explanations. Thanks.
Yiliang
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Source: — Data Sufficiency |
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by cramya » Sat Feb 21, 2009 7:41 pm
https://www.beatthegmat.com/gmat-prep-re ... 16996.html

Please see Ian's explanation.

Regards,
CR
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by billzhao » Sat Feb 21, 2009 7:55 pm
Thanks!
Yiliang
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