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# If M and N are positive, what is M*N? 1) M^N = 1 2) N^M = 1

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Manager
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If M and N are positive, what is M*N? 1) M^N = 1 2) N^M = 1 [#permalink]

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22 Nov 2008, 09:17
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If M and N are positive, what is M*N?

1) M^N = 1

2) N^M = 1
SVP
Joined: 29 Aug 2007
Posts: 2476
Followers: 70

Kudos [?]: 774 [0], given: 19

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22 Nov 2008, 13:59
jjhko wrote:
If M and N are positive, what is M*N?

1) M^N = 1

2) N^M = 1

D.
1: Since M and N both are +ve, M and N, each, should be 1. So M*N = 1

2: Since M and N both are +ve, M and N, each, should be 1. So M*N = 1
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SVP
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23 Nov 2008, 00:28
[quote="jjhko"]If M and N are positive, what is M*N?

1) M^N = 1

2) N^M = 1

m,n are non zero and +ve.

from 1

m= 1 , n is any intiger. insuff

from 2
n = 1 , m is any intiger.....insuff

both n=m=1............C
Manager
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23 Nov 2008, 00:37
from (1), M =1 but n can be anything. Ditto for M in (2).
GMAT TIGER wrote:
jjhko wrote:
If M and N are positive, what is M*N?

1) M^N = 1

2) N^M = 1

D.
1: Since M and N both are +ve, M and N, each, should be 1. So M*N = 1

2: Since M and N both are +ve, M and N, each, should be 1. So M*N = 1
SVP
Joined: 29 Aug 2007
Posts: 2476
Followers: 70

Kudos [?]: 774 [0], given: 19

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23 Nov 2008, 22:17
prasun84 wrote:
from (1), M =1 but n can be anything. Ditto for M in (2).
GMAT TIGER wrote:
jjhko wrote:
If M and N are positive, what is M*N?

1) M^N = 1

2) N^M = 1

D.
1: Since M and N both are +ve, M and N, each, should be 1. So M*N = 1

2: Since M and N both are +ve, M and N, each, should be 1. So M*N = 1

You are right. Do not know what I immagined, irrationally.

agree with C....
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Re: DS - exponents   [#permalink] 23 Nov 2008, 22:17
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