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If M and N are positive, what is M*N ? [#permalink ]
21 Nov 2009, 09:05

Question Stats:

59% (01:44) correct

41% (00:45) wrong

based on 97 sessions
If M and N are positive, what is M*N ?

(1) M^N=1

(2) N^M=1

Answer is

. But I picked

. M, N could be 0, or 1, because whatever to the power of zero is 1. Or is it different in GMATland?

Thanks guys

Last edited by

Bunuel on 04 Jul 2013, 22:48, edited 1 time in total.

Added the OA.

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Re: GMAT Club Test...needs clarification. Thanks [#permalink ]
21 Nov 2009, 09:28

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Re: GMAT Club Test...needs clarification. Thanks [#permalink ]
21 Nov 2009, 19:27

agree. gmat club teaches you to really be careful in reading the question

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Re: GMAT Club Test...needs clarification. Thanks [#permalink ]
21 Nov 2009, 22:18

thanks guys. tricky.

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Re: GMAT Club Test...needs clarification. Thanks [#permalink ]
22 Nov 2009, 04:32

St1: M^N=1 => M =1 & N=any number or M= any number & N=0; So M*N could be 0 or any number; Insuff St2: N^M=1 => M =any number & N=1 or M= 0 & N=any number; So M*N could be 0 or any number; Insuff Combined M=1 and N=1. Hence M*N=1 Hence C

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Re: If M and N are positive, what is M*N ? [#permalink ]
26 Dec 2013, 03:05
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wolver123 wrote:

If M and N are positive, what is M*N ?

(1) M^N=1

(2) N^M=1

Answer is

. But I picked

. M, N could be 0, or 1, because whatever to the power of zero is 1. Or is it different in GMATland?

Thanks guys

IMO C.

M and N are positive , hence M or N cannot be 0. 1) M = 1 and N can be 1,2,3.. .. hene M*N can be 1,2,3....Not Sufficient.

2) N=1 and M can be anything 1,2,3 ... Not sufficient ....

Combined .. we have M=1 and N=1 .. Sufficient....

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Re: If M and N are positive, what is M*N ? [#permalink ]
27 Jun 2014, 01:07

Bunuel wrote:

wolver123 wrote:

If M and N are positive , what is M*N ? 1.M^N=1 2.N^M=1 Answer is C. But I picked E. M, N could be 0, or 1, because whatever to the power of zero is 1. Or is it different in GMATland? Thanks guys

m and n are positive. (1) m^n=1 --> m=1 and n is any value (satisfying the condition that they are both positive). mn unknown. Not sufficient;

(2) n^m=1 --> n=1 and m is any value (satisfying the condition that they are both positive). mn unknown. Not sufficient;

(1)+(2) m=1 and n=1, mn=1. Sufficient.

Answer: C.

Thanks. In GC math book I read that 0 should be treated as positive. Please correct me if I am wrong here.

Regards,

Ashish

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Re: If M and N are positive, what is M*N ? [#permalink ]
27 Jun 2014, 01:17

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asagraw wrote:

Bunuel wrote:

wolver123 wrote:

If M and N are positive , what is M*N ? 1.M^N=1 2.N^M=1 Answer is C. But I picked E. M, N could be 0, or 1, because whatever to the power of zero is 1. Or is it different in GMATland? Thanks guys

m and n are positive. (1) m^n=1 --> m=1 and n is any value (satisfying the condition that they are both positive). mn unknown. Not sufficient;

(2) n^m=1 --> n=1 and m is any value (satisfying the condition that they are both positive). mn unknown. Not sufficient;

(1)+(2) m=1 and n=1, mn=1. Sufficient.

Answer: C.

Thanks. In GC math book I read that 0 should be treated as positive. Please correct me if I am wrong here.

Regards,

Ashish

Where in math book is written this?

0 is neither positive nor negative integer (the only one of this kind).

Check tips on number properties here:

tips-and-hints-for-specific-quant-topics-with-examples-172096.html#p1371030 _________________

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Re: If M and N are positive, what is M*N ?
[#permalink ]
27 Jun 2014, 01:17