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Number Properties from GMATPrep

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Number Properties from GMATPrep [#permalink] New post 28 Sep 2009, 00:46
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28% (01:59) correct 71% (01:45) wrong based on 0 sessions
Plese help me to solve that problem.
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Re: Number Properties from GMATPrep [#permalink] New post 28 Sep 2009, 01:33
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multiplication of 8 first pos. int.
1*2*3*...*8=1*2^7*3^2*5*7
So we can see that there may be 3 different a values
2=>a^n can be 2^2, 2^3,...2^7
3=>a^n can be 3^2
4=>a^n can be 4^2, 4^3

Lets come to options
1) insuff.
There are 2 options for a
a=2, n=6
a=4, n=3

2)suff.
There is only one option for a that is 2.

B.
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Re: Number Properties from GMATPrep [#permalink] New post 28 Sep 2009, 03:45
Brilliant, thank you!
Re: Number Properties from GMATPrep   [#permalink] 28 Sep 2009, 03:45
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Number Properties from GMATPrep

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