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

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VP
Joined: 22 Nov 2007
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If m and n are positive integers and mn=k is m + n = k +1? [#permalink]

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07 Mar 2008, 12:44
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If m and n are positive integers and mn=k is m + n = k +1?
(1) m=1.
(2) k is a prime number.

Kudos [?]: 687 [0], given: 0

Senior Manager
Joined: 15 Aug 2007
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Schools: Chicago Booth

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07 Mar 2008, 12:50
D

1 - suff. if m=1 => n=k

2 - suff. if k is prime, either m or n must be 1 which implies again m or n = k

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CEO
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08 Mar 2008, 20:58
marcodonzelli wrote:
If m and n are positive integers and mn=k is m + n = k +1?
(1) m=1.
(2) k is a prime number.

D.

1: just plug in 1*n=k ---> m+n=k+1. thus 1+n=n+1

2: must work. Just try values.

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Re: gmat prep integ   [#permalink] 08 Mar 2008, 20:58
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# If m and n are positive integers and mn=k is m + n = k +1?

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