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Number Properties from GMATPrep

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Manager
Manager
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Joined: 12 Mar 2009
Posts: 192
Followers: 1

Kudos [?]: 94 [0], given: 60

Number Properties from GMATPrep [#permalink] New post 27 Sep 2009, 23:46
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

45% (01:23) correct 55% (02:07) wrong based on 13 sessions
Plese help me to solve that problem.
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1 KUDOS received
Senior Manager
Senior Manager
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Joined: 23 Jun 2009
Posts: 359
Location: Turkey
Schools: UPenn, UMich, HKS, UCB, Chicago
Followers: 5

Kudos [?]: 95 [1] , given: 60

Re: Number Properties from GMATPrep [#permalink] New post 28 Sep 2009, 00:33
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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.
Manager
Manager
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Joined: 12 Mar 2009
Posts: 192
Followers: 1

Kudos [?]: 94 [0], given: 60

Re: Number Properties from GMATPrep [#permalink] New post 28 Sep 2009, 02:45
Brilliant, thank you!
Re: Number Properties from GMATPrep   [#permalink] 28 Sep 2009, 02:45
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Number Properties from GMATPrep

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