If the integers a and n are greater than 1 and the product

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If the integers a and n are greater than 1 and the product [#permalink]

09 Mar 2008, 02:00

If the integers a and n are greater than 1 and the product of the first 8 positive
integers is a multiple of a^n, what is the value of a?

1) a^n = 64
2) n = 6

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Re: exponents and integers [#permalink]

09 Mar 2008, 07:35

From St-1: a^n*K = 8!. a can be anything 2,3,4 given a value of n. Basically 2 degrees of freedom.

From St-2: a^6*K = 8! -> a can only be 2.

So B.
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Re: exponents and integers [#permalink]

09 Mar 2008, 11:27

yes, I agree with B as well

we need to find the number that has the most number of factors in 8!, it is only 2..and thus n=6

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Re: exponents and integers [#permalink]

09 Mar 2008, 11:49

GMAT TIGER wrote:

neelesh wrote:

From St-1: a^n*K = 8!. a can be anything 2,3,4 given a value of n. Basically 2 degrees of freedom.

From St-2: a^6*K = 8! -> a can only be 2.

So B.

how is a =3?

in statment 1) a can only be 1, 2 and 64 etc but yes not 3..or 5 or 7..

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Re: exponents and integers [#permalink]

09 Mar 2008, 13:36

how can we quickly tell that 8! will be divisible by 64 ?

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Re: exponents and integers [#permalink]

09 Mar 2008, 21:52

pmenon wrote:

how can we quickly tell that 8! will be divisible by 64 ?

8! = 1x2x3x4x5x6x7x8
8! = 1x2x3x2x2x5x2x3x7x2x2x2

8! has altogather seven 2s.
64 = 2x2x2x2x2x2
64 has 6 2s.

so 8!/64 = 2^7 x 3^2 x 5 x 7 / 2^6 = 2 x 3^2 x 5 x 7 = 630
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Re: exponents and integers [#permalink] 09 Mar 2008, 21:52

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If the integers a and n are greater than 1 and the product

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If the integers a and n are greater than 1 and the product

If the integers a and n are greater than 1 and the product

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