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## gmat prep question

This topic has 1 member reply
yvonne12 Master | Next Rank: 500 Posts
Joined
07 Feb 2007
Posted:
144 messages

#### gmat prep question

Fri Apr 20, 2007 3:09 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

I want to know how I should evaluate this q.

I dont know how it can be D

jayhawk2001 Community Manager
Joined
28 Jan 2007
Posted:
789 messages
Followed by:
1 members
30
Fri Apr 20, 2007 4:02 pm
yvonne12 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

I want to know how I should evaluate this q.

I dont know how it can be D
1 - sufficient. mn = k. So, if m = 1, n = k. So m+n = 1+k

2 - sufficient. If k is prime, the only 2 factors are k and 1. So only 2
values are possible. {m=k, n=1} or {m=1, n=k}. Both yield k+1 as sum

Hence D.

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