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For all positive integers m, [m]=3m when m is odd

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Intern
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B
Joined: 29 Oct 2016
Posts: 26
Re: For all positive integers m, [m]=3m when m is odd  [#permalink]

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New post 02 May 2017, 17:05
I am trying to figure out what concepts can be taken from this question. I understand it's an arithmetic question, for which an understanding of integers, multiplication, odd/even properties is required, but the fact that you are looking for the answer which equals 81 did not occur to me when I attempted this question. Is there a name for this concept and/or how can we expect to categorize this and look out for it in future questions? Does this technically require an understanding of functions/nomenclature?
CEO
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Joined: 12 Sep 2015
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Re: For all positive integers m, [m]=3m when m is odd  [#permalink]

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New post 19 Apr 2018, 15:53
Top Contributor
Guduna wrote:
For all positive integers m, [m]=3m when m is odd and [m]=(1/2)*m when m is even. What is [9]*[6] equivalent to?

A. [81]
B. [54]
C. [37]
D. [27]
E. [18]


9 is odd, so [9] = (3)(9) = 27
6 is even, so [6] = 6/2 = 3
So, [9] x [6] = 27 x 3 = 81

BEFORE you select answer choice A, notice that 81 has brackets around it.
Since 81 is odd, [81] = (3)(81) = 243
So, answer choice A is NOT correct.

So, which of the 5 answer choices equals 81?

Since 27 is odd, [27] = (3)(27) = 81

So, the correct answer is D

Cheers,
Brent
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Brent Hanneson – GMATPrepNow.com
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Re: For all positive integers m, [m]=3m when m is odd &nbs [#permalink] 19 Apr 2018, 15:53

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