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Intern  Joined: 12 May 2012
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Location: United States
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If a number (N) is divisible by 33, what will be the minimum  [#permalink]

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Difficulty:   15% (low)

Question Stats: 82% (01:18) correct 18% (01:32) wrong based on 167 sessions

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If a number (N) is divisible by 33, what will be the minimum value of k, such that N^k should definitely be divisible by 27?

A. 1
B. 2
C. 3
D. 4
E. 6

Originally posted by sarb on 08 Jun 2012, 09:20.
Last edited by abhimahna on 14 Feb 2018, 00:07, edited 2 times in total.
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Re: If a number (N) is divisible by 33, what will be the minimum  [#permalink]

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sarb wrote:
If a number (N) is divisible by 33, what will be the minimum value of k, such that Nk should definitely be divisible by 27?

1
2
3
4
6

I guess it should be N^k instead of Nk.

Given that N is divisible by 33=3*11. Now, in order N^k to be divisible by 27=3^3 then k must be at least 3 in order N^k to have enough 3's.

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Re: If a number (N) is divisible by 33, what will be the minimum  [#permalink]

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1
were it to be nk, the minimum value of k is 9
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GMAT 1: 770 Q50 V46 Re: If a number (N) is divisible by 33, what will be the minimum  [#permalink]

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n = 3*11*m

n^k = 3^k*11^k*m^k

27 = 3^3

so k must be at least 3
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Re: If a number (N) is divisible by 33, what will be the minimum  [#permalink]

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Bunuel wrote:
sarb wrote:
If a number (N) is divisible by 33, what will be the minimum value of k, such that Nk should definitely be divisible by 27?

1
2
3
4
6

I guess it should be N^k instead of Nk.

Given that N is divisible by 33=3*11. Now, in order N^k to be divisible by 27=3^3 then k must be at least 3 in order N^k to have enough 3's.

Thanks as usual, Bunuel. Could you help me wrap my head around this some more?

So N is divisible by 3*11
and N^k is divisible by 3*3*3.

So why exactly does the minimum value for k only need to be 3? Could you possibly use some example values here?
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Re: If a number (N) is divisible by 33, what will be the minimum  [#permalink]

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Bunuel wrote:
sarb wrote:
If a number (N) is divisible by 33, what will be the minimum value of k, such that Nk should definitely be divisible by 27?

1
2
3
4
6

I guess it should be N^k instead of Nk.

Given that N is divisible by 33=3*11. Now, in order N^k to be divisible by 27=3^3 then k must be at least 3 in order N^k to have enough 3's.

Thanks as usual, Bunuel. Could you help me wrap my head around this some more?

So N is divisible by 3*11
and N^k is divisible by 3*3*3.

So why exactly does the minimum value for k only need to be 3? Could you possibly use some example values here?

N^k to be divisible by 3^3 should have 3^3 as a factor and since N has only one 3 in its prime factorization then k must be at least 3.
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Re: If a number (N) is divisible by 33, what will be the minimum  [#permalink]

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Yup its 3.. ...Yupppppiee..
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Re: If a number (N) is divisible by 33, what will be the minimum  [#permalink]

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1
N is divisible by 33 ...

Prime factors of 33 are 3 x 11 ...

Therefore N has at the least one three and one eleven as its prime factors ..

Now N^k should be divisible by 27 i.e. 3 x 3 x 3

In order for N^K to be divisible by 27 , N^k must contain at least 3 three's .. In order for N^k to be DEFINITELY divisible by 27 it needs to have at least 3 3's as its prime factors .. we know that n has at least one 3 , therefore it needs three 3's , thus min possible value of k is 3 , and that would occur if n has exactly one three as one of its prime factor .. The max value for k would obviously be anything more than 3 uptil infinite ...

Therefore answer is 3 (C)
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Re: If a number (N) is divisible by 33, what will be the minimum  [#permalink]

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sarb wrote:
If a number (N) is divisible by 33, what will be the minimum value of k, such that N^k should definitely be divisible by 27?

A. 1
B. 2
C. 3
D. 4
E. 6

Since N is divisible by 33, we see that N has, at a minimum, one prime factor of 3. In order for N^k/27 = integer, we see that N must have at least three primes of 3 (since 27 has three factors of 3), and thus the minimum value of k would have to be 3, since 33^3 = 3^3 x 11^3 = 27 x 11^3.

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If you find one of my posts helpful, please take a moment to click on the "Kudos" button. Re: If a number (N) is divisible by 33, what will be the minimum   [#permalink] 02 Feb 2018, 12:22
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