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If m is 2digit positive integer and n is a positive integer, what is
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Updated on: 13 Oct 2016, 19:04
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If m is 2digit positive integer and n is an integer, what is the units digit of (2^n)(m)(5^n)? 1) m=17 2) n=3
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Re: If m is 2digit positive integer and n is a positive integer, what is
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30 Sep 2016, 07:48
MathRevolution wrote: If m is 2digit positive integer and n is a positive integer, what is the units digit of (2^n)(m)(5^n)? 1) m=17 2) n=3 \((2^n)(m)(5^n) = (10^n)(m)\) Now any number multiplied by 10 will always have 0 at the units place. in the expression above, what ever the value of m is, we will always get 0 at the unit place provided n <> 0. So, we need to know the value of n only. Only Statement B is sufficient. Hence B.
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Re: If m is 2digit positive integer and n is a positive integer, what is
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30 Sep 2016, 07:58
abhimahna wrote: MathRevolution wrote: If m is 2digit positive integer and n is a positive integer, what is the units digit of (2^n)(m)(5^n)? 1) m=17 2) n=3 \((2^n)(m)(5^n) = (10^n)(m)\) Now any number multiplied by 10 will always have 0 at the units place. in the expression above, what ever the value of m is, we will always get 0 at the unit place provided n <> 0. So, we need to know the value of n only. Only Statement B is sufficient. Hence B. I doubt this question. Since we are clearly given that n is a positive integer...i.e. n can't be a 0. Since 0 is neither positive nor negative integer (the only one of this kind). Then obviously the value of n can be from 1 to infinite as per given positive integer condition..whatever the value of n is we always get 0 as the units digit irrespective of m value and n value for this case. I feel that n is a positive information shouldn't be given...then B is sufficient. Any thoughts ?



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Re: If m is 2digit positive integer and n is a positive integer, what is
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30 Sep 2016, 09:02
msk0657 wrote: abhimahna wrote: MathRevolution wrote: If m is 2digit positive integer and n is a positive integer, what is the units digit of (2^n)(m)(5^n)? 1) m=17 2) n=3 \((2^n)(m)(5^n) = (10^n)(m)\) Now any number multiplied by 10 will always have 0 at the units place. in the expression above, what ever the value of m is, we will always get 0 at the unit place provided n <> 0. So, we need to know the value of n only. Only Statement B is sufficient. Hence B. I doubt this question. Since we are clearly given that n is a positive integer...i.e. n can't be a 0. Since 0 is neither positive nor negative integer (the only one of this kind). Then obviously the value of n can be from 1 to infinite as per given positive integer condition..whatever the value of n is we always get 0 as the units digit irrespective of m value and n value for this case. I feel that n is a positive information shouldn't be given...then B is sufficient. Any thoughts ? Yes, correct. n should be given as non negative integer. Then only it would be B. So, the current question is not GMAT like question. MathRevolution, please recheck the question and post the corrected one.
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Re: If m is 2digit positive integer and n is a positive integer, what is
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30 Sep 2016, 18:49
MathRevolution wrote: If m is 2digit positive integer and n is a positive integer, what is the units digit of (2^n)(m)(5^n)? 1) m=17 2) n=3 Units digit will always be zero, given the conditions provided in the stem. D



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Re: If m is 2digit positive integer and n is a positive integer, what is
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02 Oct 2016, 03:55
==> In the original condition, you get 2 variables(m,n) and the answer is C. However, since this is an integer problem, a key question, if you apply CMT 4(A), when you solve 2), the first digit of (2^3)(m)(5^3) is always 0, so suffi. The answer is B. Answer B
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Re: If m is 2digit positive integer and n is a positive integer, what is
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13 Oct 2016, 19:05
Hi all, Sorry about the mistake and the question has been edited. It is supposed to be n is an integer. Thank you.
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Re: If m is 2digit positive integer and n is a positive integer, what is
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17 Oct 2016, 04:01
This question is incorrectly tagged as probability . Abhishek009, you may want to tag this question to Remainders .



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Re: If m is 2digit positive integer and n is a positive integer, what is
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17 Oct 2016, 04:04



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Re: If m is 2digit positive integer and n is a positive integer, what is
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Re: If m is 2digit positive integer and n is a positive integer, what is
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