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Manager  Joined: 25 Jul 2010
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If n is a non-negative integer such that 12^n is a divisor  [#permalink]

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Question Stats: 62% (01:35) correct 38% (01:53) wrong based on 601 sessions

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If n is a non-negative integer such that 12^n is a divisor of 3,176,793, what is the value of n^12-12^n?

A. -11
B. -1
C. 0
D. 1
E. 11

Originally posted by Orange08 on 18 Sep 2010, 12:48.
Last edited by Bunuel on 29 Mar 2013, 02:41, edited 2 times in total.
Edited the question
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Re: Divisor of 3,176,793  [#permalink]

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Orange08 wrote:
If n is a non-negative integer such that 12n is a divisor of 3,176,793, what is the value of n^12 – 12^n ?

a. -11
b. -1
c. 0
d. 1
e. 11

If the answer is B then I think it should be $$12^n$$ instead of $$12n$$

So the question would be:
If n is a non-negative integer such that 12^n is a divisor of 3,176,793, what is the value of n^12-12^n?

3,176,793 is an odd number. The only way it to be a multiple of $$12^n$$ (even number in integer power) is when $$n=0$$, in this case $$12^n=12^0=1$$ and 1 is a factor of every integer.

Then $$n^{12}-12^n=0^{12}-12^0=-1$$.

Hope it helps.
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Re: Divisor of 3,176,793  [#permalink]

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3176793 is odd
12n is even
How can 12n be a divisor ?

The only answer I can think is n=0 which means -1

But I don't think you can count 0 as a "divisor"
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Re: Divisor of 3,176,793  [#permalink]

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Precisely, for this reason, I have posted this question here.
I am unclear is 0 should be considered as divisor.
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Re: Divisor of 3,176,793  [#permalink]

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Orange08 wrote:
Precisely, for this reason, I have posted this question here.
I am unclear is 0 should be considered as divisor.

What's the source of the question ?

I am sure the only possible answer is -1, just not sure about the validity of the question
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Originally posted by shrouded1 on 18 Sep 2010, 13:10.
Last edited by shrouded1 on 18 Sep 2010, 16:50, edited 1 time in total.
Manager  Joined: 17 Feb 2011
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GMAT 1: 760 Q50 V44 Re: Divisor of 3,176,793  [#permalink]

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Nice question!

Bunuel's approach is very good.

Thanks!
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Re: Divisor of 3,176,793  [#permalink]

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Thanks Bunnel's for this in depth explanation!!
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-12^n will always be an even number because it will be a multiple of 12. however 3,176,793 is odd and there is no case when a positive number of n would be a factor of 3,176,793. Only number that would match is when n is zero.
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Re: If n is a non-negative integer such that 12n is a divisor of  [#permalink]

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nave81 wrote:
If n is a non-negative integer such that $$12^n$$ is a divisor of 3,176,793, what is the value of n^12 - 12^n?

A. -11
B. - 1
C. 0
D. 1
E. 11

n is any integer $$>=0$$. Also, $$12^n$$ is a divisor of the given number. $$12^0$$ = 1 is a divisor of the given number. Replacing n = 0 in the given expression, we have 0^12 - 12^0 = -1.

Note that for any other value of n, there will be a factor of 2 in $$12^n$$. But the given number is odd and thus, has no factor of 2. Therefore, any other power of 12, can not be a divisor of the given number.

B.
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Re: If n is a non-negative integer such that 12n is a divisor of  [#permalink]

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nave81 wrote:
If n is a non-negative integer such that $$12^n$$ is a divisor of 3,176,793, what is the value of n^12 - 12^n?

A. -11
B. - 1
C. 0
D. 1
E. 11

The only way that $$12^n$$ can be a divisor of 3 is if $$n=0, 12^0=1$$. So $$n=0$$
0^(12) - 12^0=0-1=-1

B
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Re: Divisor of 3,176,793  [#permalink]

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3,176,793 is an odd number. The only way it to be a multiple of $$12^n$$ (even number in integer power) is when $$n=0$$, in this case $$12^n=12^0=1$$ and 1 is a factor of every integer.

Can you elaborate on this.. The sum of the digits add up to 9 the only example I thought of 12^2 = 144

does sum of the digits have any relation to this question or it isn't related?
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Re: Divisor of 3,176,793  [#permalink]

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fozzzy wrote:
3,176,793 is an odd number. The only way it to be a multiple of $$12^n$$ (even number in integer power) is when $$n=0$$, in this case $$12^n=12^0=1$$ and 1 is a factor of every integer.

Can you elaborate on this.. The sum of the digits add up to 9 the only example I thought of 12^2 = 144

does sum of the digits have any relation to this question or it isn't related?

No, the sum of the digits is not relevant for this question.

3,176,793 is an odd number. An odd number cannot be a multiple of any even number, and 12^n is even for any positive integer n. Therefore n cannot be positive which means that n can only be 0.

Hope it's clear.

Similar question to practice: new-tough-and-tricky-exponents-and-roots-questions-125956-40.html#p1029223
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Re: If n is a non-negative integer such that 12^n is a divisor  [#permalink]

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Bunuel wrote:
fozzzy wrote:
3,176,793 is an odd number. The only way it to be a multiple of $$12^n$$ (even number in integer power) is when $$n=0$$, in this case $$12^n=12^0=1$$ and 1 is a factor of every integer.

Can you elaborate on this.. The sum of the digits add up to 9 the only example I thought of 12^2 = 144

does sum of the digits have any relation to this question or it isn't related?

No, the sum of the digits is not relevant for this question.

3,176,793 is an odd number. An odd number cannot be a multiple of any even number, and 12^n is even for any positive integer n. Therefore n cannot be positive which means that n can only be 0.

Hope it's clear.

Similar question to practice: new-tough-and-tricky-exponents-and-roots-questions-125956-40.html#p1029223

Hi Bunuel,

I did not notice that the number given is odd and do the thinking in mind. Rather I read the Q and understood that 12^n should be a divisor on the huge number. 1 is a divisor of the number. and 12^0=1 and hence n=0 satisfies the Q.
So I realized that n&^12-12^n = -1.
if I follow this approach, Will I face a pit fall in any other question similar to this one?
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Re: If n is a non-negative integer such that 12^n is a divisor  [#permalink]

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0^anything=0

anything^0=1

Therefore the only value for n=0.

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Re: If n is a non-negative integer such that 12^n is a divisor  [#permalink]

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Orange08 wrote:
If n is a non-negative integer such that 12^n is a divisor of 3,176,793, what is the value of n^12-12^n?

A. -11
B. -1
C. 0
D. 1
E. 11

First notice the big hint right from the start: n is a non-negative integer
Your first reaction should be "Why not just tell us that n is positive?"
The reason is that the test-maker wants to include zero as a possible value for n (and zero is neither positive nor negative).

Since the test-maker went to the trouble to keep zero as a possible value for n, let's check to see whether n = 0 works.
Well, 12^0 = 1, and 1 is a divisor of 3,176,793. So n must equal 0.

Now that we know the value of n, we can evaluate n^12 - 12^n

n^12 - 12^n = 0^12 - 12^0 = 0 - 1
= -1

Cheers,
Brent
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GMAT 1: 800 Q51 V49 GRE 1: Q170 V170 Re: If n is a non-negative integer such that 12^n is a divisor  [#permalink]

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Hi All,

This question is built around a number of interesting Number Property rules. Here's how you can use those rules to avoid doing a lot of 'math' on this question.

12^N implies that we're probably dealing with an EVEN number (unless N = 0, in which 12^0 = 1). But we're told that 12^N is a divisor of 3,176,793, which is a big ODD number. EVEN numbers DO NOT divide evenly into ODD numbers, so N CANNOT be a positive number. Since we're told that N is A NON-NEGATIVE INTEGER, the only other possibility is when N = 0.

Knowing this, the rest of the math is fairly straightforward:

(0^12) - (12^0) = 0 - 1 = -1

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Re: If n is a non-negative integer such that 12^n is a divisor  [#permalink]

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_________________ Re: If n is a non-negative integer such that 12^n is a divisor   [#permalink] 18 Mar 2019, 14:11
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