GPREP If m and n are positive integers..

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quriousaddict: Junior | Next Rank: 30 Posts; Posts: 13; Joined: Sat Apr 04, 2009 1:19 pm

by quriousaddict » Tue May 05, 2009 5:58 pm

If m and n are positive integers and mn = k, is m + n = k + 1?

1. m = 1

2. k is a prime number

OA D

Can someone explain why B is also sufficient? Thanks

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Source: Beat The GMAT — Data Sufficiency | Tue May 05, 2009 5:58 pm

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

by cramya » Tue May 05, 2009 6:11 pm

If k is prime either m or n must be prime and 1 not necessarily in that order.

A prime has only 2 factors 1 and itself.

m+n will always be equal k+1

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