Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Re: If m and n are negative integers, what is the value of mn? [#permalink]
04 Jun 2011, 05:03

Expert's post

Welcome to the forum!

Edited

1) m^n = 1/81 81 = 9*9 = 3*3*3*3 --> m = -9, n = -2 (mn=18) or m=-3, n =-4 (mn=12). Insufficient.

2) n^m = -1/64 64 = 2*2*2*2*2*2 = 4*4*4 = 8*8 --> m has to be an odd integer to get negative result. m = -1, n = -64 (mn=64) or m=-3, n =-4 (mn=12) . Inufficient.

Re: If m and n are negative integers, what is the value of mn? [#permalink]
04 Jun 2011, 05:23

2

This post received KUDOS

Hii walker, thanks for the welcome and for the explanation. I did solved the A option correctly and concluded that it gave two options for mn. However I need a little more help, option B says -1/64, if question says 2 negative integers, wouldn't -64 ^ -1 also end being -1/64, then B too will have indefinite answer for mn. ( -3,-4) and (-1, -64) ?

Re: If m and n are negative integers, what is the value of mn? [#permalink]
04 Jun 2011, 05:42

thanks for confirming that -64^ -1 is also a valid solution. In that case C should be the answer , as (-3,-4) appears in both options. However the original explanation too seemed to have missed (-64, -1) in B, the OE says only (-3,-4) as a solution for B. So OA was B. However I think C should be the answer. the question is from DS challenge set by jeff sackmann. This is only solution among all in his sets with which I am not feeling comfortable.

gmatclubot

Re: If m and n are negative integers, what is the value of mn?
[#permalink]
04 Jun 2011, 05:42