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# Exponent problem: Please show me the easy way.....

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Exponent problem: Please show me the easy way..... [#permalink]  26 Oct 2011, 23:06
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Difficulty:

5% (low)

Question Stats:

83% (01:34) correct 17% (00:56) wrong based on 70 sessions
What is greatest positive integer n such that 2^n is a factor of 12^10?

a)10
b)12
c)16
d)20
e)60

Please show me the easy way to solve such question...
[Reveal] Spoiler: OA

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All I want to be A Self-made Man

Manager
Joined: 21 Aug 2010
Posts: 189
Location: United States
GMAT 1: 700 Q49 V35
Followers: 2

Kudos [?]: 75 [1] , given: 141

Re: Exponent problem: Please show me the easy way..... [#permalink]  26 Oct 2011, 23:32
1
KUDOS
What is greatest positive integer n such that 2^n is a factor of 12^10?

a)10
b)12
c)16
d)20
e)60

Please show me the easy way to solve such question...

The given number is 12^10
=(2*2*3)^10
=(2^20)*(3^10)

So the greatest possible value for n such that 2^n can be factor of given number is 20.

Posted from my mobile device
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Location: Pune, India
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Kudos [?]: 9592 [1] , given: 197

Re: Exponent problem: Please show me the easy way..... [#permalink]  27 Oct 2011, 04:02
1
KUDOS
Expert's post
What is greatest positive integer n such that 2^n is a factor of 12^10?

a)10
b)12
c)16
d)20
e)60

Please show me the easy way to solve such question...

$$12^{10} = (2^2*3)^{10} = 2^{20}*3^{10}$$
The greatest value of n such that $$2^n$$ is a factor of $$12^{10}$$ is 20.

Such questions are more popular and a little more complex with factorials. e.g. What is greatest positive integer n such that $$2^n$$ is a factor of 12!
Try this one.
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Karishma
Veritas Prep | GMAT Instructor
My Blog

Get started with Veritas Prep GMAT On Demand for $199 Veritas Prep Reviews Intern Joined: 27 Sep 2011 Posts: 17 Followers: 0 Kudos [?]: 28 [0], given: 9 Re: Exponent problem: Please show me the easy way..... [#permalink] 27 Oct 2011, 07:00 Thanks gopu106........ _________________ All I want to be A Self-made Man Intern Joined: 27 Sep 2011 Posts: 17 Followers: 0 Kudos [?]: 28 [0], given: 9 Re: Exponent problem: Please show me the easy way..... [#permalink] 27 Oct 2011, 07:03 VeritasPrepKarishma wrote: aselfmademan wrote: What is greatest positive integer n such that 2^n is a factor of 12^10? a)10 b)12 c)16 d)20 e)60 Please show me the easy way to solve such question... $$12^{10} = (2^2*3)^{10} = 2^{20}*3^{10}$$ The greatest value of n such that $$2^n$$ is a factor of $$12^{10}$$ is 20. Such questions are more popular and a little more complex with factorials. e.g. What is greatest positive integer n such that $$2^n$$ is a factor of 12! Try this one. Thank you very much.......... I am very weak in this type of PS math Could you please explain 12! math you have given ? _________________ All I want to be A Self-made Man Manager Joined: 21 Aug 2010 Posts: 189 Location: United States GMAT 1: 700 Q49 V35 Followers: 2 Kudos [?]: 75 [0], given: 141 Re: Exponent problem: Please show me the easy way..... [#permalink] 27 Oct 2011, 19:32 VeritasPrepKarishma wrote: aselfmademan wrote: What is greatest positive integer n such that 2^n is a factor of 12^10? a)10 b)12 c)16 d)20 e)60 Please show me the easy way to solve such question... $$12^{10} = (2^2*3)^{10} = 2^{20}*3^{10}$$ The greatest value of n such that $$2^n$$ is a factor of $$12^{10}$$ is 20. Such questions are more popular and a little more complex with factorials. e.g. What is greatest positive integer n such that $$2^n$$ is a factor of 12! Try this one. n = 10 I just counted the number of 2s till 12 since the 12! is multiplication of all numbers till 12 Do you have any faster method which can be used for bigger factorials? _________________ ------------------------------------- Veritas Prep GMAT Instructor Joined: 16 Oct 2010 Posts: 6219 Location: Pune, India Followers: 1676 Kudos [?]: 9592 [0], given: 197 Re: Exponent problem: Please show me the easy way..... [#permalink] 27 Oct 2011, 19:39 Expert's post Check out this post: http://www.veritasprep.com/blog/2011/06 ... actorials/ It discusses how to solve such questions quickly. _________________ Karishma Veritas Prep | GMAT Instructor My Blog Get started with Veritas Prep GMAT On Demand for$199

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Re: Exponent problem: Please show me the easy way..... [#permalink]  28 Oct 2011, 21:58
Thanksss
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Re: Exponent problem: Please show me the easy way.....   [#permalink] 28 Oct 2011, 21:58
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