Remainder problem

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billzhao: Senior | Next Rank: 100 Posts; Posts: 80; Joined: Mon Feb 02, 2009 6:36 am; Thanked: 10 times

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: Beat The GMAT — Data Sufficiency | Sat Feb 21, 2009 7:33 pm

cramya: Legendary Member; Posts: 2467; Joined: Thu Aug 28, 2008 6:14 pmFollowed by: 11 members; Thanked: 331 times

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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billzhao: Senior | Next Rank: 100 Posts; Posts: 80; Joined: Mon Feb 02, 2009 6:36 am; Thanked: 10 times

by billzhao » Sat Feb 21, 2009 7:55 pm

Thanks!

Yiliang

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