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

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If m and n are positive integers and mn=k is m + n = k +1? [#permalink]  07 Mar 2008, 11:44
If m and n are positive integers and mn=k is m + n = k +1?
(1) m=1.
(2) k is a prime number.
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Re: gmat prep integ [#permalink]  07 Mar 2008, 11:50
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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Re: gmat prep integ [#permalink]  08 Mar 2008, 19:58
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.
Re: gmat prep integ   [#permalink] 08 Mar 2008, 19:58
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