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right, I agree...it is given in the instructions...[M] = M/2 when M is even...i guess I am confused about the order of operations...if you do the dictated operations FIRST then you get 81...if you multiply 9 times 6 First then you get 54 which is even and then taking half you get 27 which is apparently the right answer. I think it is poorly worded or a mistake. There is nothing to indicate that you need to do the multiplication first.

I guess there are a lot of questions like this...where you get some kind of rule imposed on numbers, and i always thought that takes precedence over regular operations.

For all positive integers M, [M] = 3M when M is odd and [M] = 1/2M when M is even. Which of the following is equivalent to [9] * [6]?

Choices: A) 81 B) 54 C) 36 D) 27 E) 18

How is the answer not 81?

Shouldn't the answer be D only when choice D is [27] and not 27? Is there a mistake in the answer choices? should the choices be: A) [81] B) [54] C) [36] D) [27] E) [18]

I just did this question on a GMAT prep test, and the answer choices are in brackets, indicating that the answers themselves are subject to the function listed in the question (the function is also in brackets). So since the answer is 81, and 81 is odd, then it's answer D, because [27] means you multiply 27 by 3, which is 81. _________________

guys, the question is not asking for the result of [9] * [6], but its equivalent (which of the following answers, when multiplied by 3 or divided by 2, equals 81 too). I hope this helps.

Choices: A) 81 B) 54 C) 36 D) 27 E) 18

[9]*[6] = 27* 3 = 81

[X] = 81 SO X = 81/3 ( BECAUSE X HAS TO BE INTIGER AND 81 IS NOT DEVISIBLE BY TWO)

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