For all positive integers m, [m]=3m when m is odd and [m]= : GMAT Problem Solving (PS) - Page 4
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# For all positive integers m, [m]=3m when m is odd and [m]=

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29 Apr 2011, 05:54
You're ignoring the box symbol in the answer. Please try again bearing this in mind.
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29 Apr 2011, 05:56
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[9] = 3*9 = 27

[6] = 3

So [9] * [6] = 81

but we need to pick one option among the answer choices with []

So [27] = 3*27 = 81

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29 Apr 2011, 06:00
Excellent. Thank you subhashghosh.
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29 Apr 2011, 06:52
Box 9 = 3*9 =27
Box 6 = 3

Box 9 * Box 6 = 27 *3 = 81

Calculating boxes in answer we can see that box 27 is the answer.

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Re: Seemingly easy PS question! Help! [#permalink]

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01 Jul 2011, 11:34
[9]*[6] = 27*3 = 81. This often leads people to choose answer choice A, but notice that answer choice A is not equal to 81. The [] function is applied to each answer as well; answer choice A is [81] = 3*81 = 243. D is the correct answer, because [27] = 3*27 = 81 = [9]*[6].
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Re: Tough Algebra, Can anyone help me? Thanks!! [#permalink]

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01 Jul 2011, 19:07
thanks subash...the explanation was superb...i was wondering why it was not 81..in fact it is 81 but the answer is in the format of [27] thats all..thanks mate
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Re: Seemingly easy PS question! Help! [#permalink]

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08 Jul 2011, 20:03
The answer is C. Plug in numbers and calculate.
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26 Dec 2011, 10:17
For all positive integers m, (m) = 3m when m is odd and (m) = ½ m when m is even, which of the following is equivalent to (9)*(6)?

(81)
(54)
(36)
(27)
(18)

Any idea how to solve this please? OA is not provided.
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26 Dec 2011, 20:44
IMO it is (27)

(9) * (6) = 27 * 3 = 81

Now since 81 is odd m which results in 81 cannot be even so m is odd.

(m) = 81 which means 3m = 81 => m = 27

(m) = (27)
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26 Dec 2011, 22:08
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(9)=3*9=27
(6)=6/2=3
(9)*(6)=27*3=81

now to convert 81 into base form.

say m was even so 81 should be equal to (126) which is not the option
it means m is odd. so 81 =3*27=(27)

ans is D
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Re: Strange GMAT Prep Question [#permalink]

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20 Oct 2015, 16:28
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Re: Strange GMAT Prep Question   [#permalink] 20 Oct 2015, 16:28

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