GMAT Prep ?? (Divisibility) Pract2

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dferm: Master | Next Rank: 500 Posts; Posts: 446; Joined: Thu Jul 26, 2007 1:07 pm; Thanked: 6 times

by dferm » Tue May 13, 2008 3:42 pm

If n is a positive integer and r is the remainder when n^2-1 is divided by 8, what is the value of r?

(1) n is odd
(2) n is not divisible by 8

Can someone please break this down for me...

Thank.s

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Source: Beat The GMAT — Data Sufficiency | Tue May 13, 2008 3:42 pm

prabhu3645: Newbie | Next Rank: 10 Posts; Posts: 9; Joined: Thu Apr 03, 2008 11:49 am

by prabhu3645 » Tue May 13, 2008 6:17 pm

is the answer A

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dferm: Master | Next Rank: 500 Posts; Posts: 446; Joined: Thu Jul 26, 2007 1:07 pm; Thanked: 6 times

by dferm » Tue May 13, 2008 7:47 pm

YES

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