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just recently, i noticed a problem with a similar gotcha.

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just recently, i noticed a problem with a similar gotcha.  [#permalink] New post 14 Jul 2007, 23:05
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just recently, i noticed a problem with a similar gotcha.
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(extra credit) A++ for spotting the flaw in the answer...


Q: If M and N are even ints, which of the following should also be an even int?

a. (M + 2)^|N|
b. (M*N)^|M - N|
c. N^|M| * N
d. M^N * M^2
e. (M + 1)*(N - 1)[/quote]


this is oops's post that i extracted from here for the sake of simplicity: http://www.gmatclub.com/phpbb/viewtopic ... 457#343457
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 [#permalink] New post 15 Jul 2007, 01:15
This problem heavily relies on whether u accept 0 as even integer or not ( because I saw 1 or 2 GMAT problems, whose OE accept 0 as an even integer ).

Then A is out for N=0 (if 0 is even Integer), or for M=-2 (if 0 is not even integer)
B-out for M=N
D-out for M=2 N=-4
E- always ODD
So only C remains. But again if u do accept 0 as an even integer then here is also problem:

for N=0 and M=0, C is also out.However, In case u reject 0 as an even integer, then go with C:it is the only reasonable choice.
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Re: PS: originally posted by oops [#permalink] New post 17 Jul 2007, 18:53
Himalayan wrote:
just recently, i noticed a problem with a similar gotcha.
A+ for the answer
(extra credit) A++ for spotting the flaw in the answer...


Q: If M and N are even ints, which of the following should also be an even int?

a. (M + 2)^|N|
b. (M*N)^|M - N|
c. N^|M| * N
d. M^N * M^2
e. (M + 1)*(N - 1

this is oops's post that i extracted from here for the sake of simplicity: http://www.gmatclub.com/phpbb/viewtopic ... 457#343457


Definitely C . In computer science, the priority of '^' is higher than that of '*'. :roll:
c. N^|M| * N = (N^|M|) * N
Re: PS: originally posted by oops   [#permalink] 17 Jul 2007, 18:53
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