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Re: Special Characters [#permalink]
07 Apr 2012, 08:27

1

This post received KUDOS

Expert's post

galaxyblue wrote:

[m] = 3m when m is odd [m] = 1/2m when m is even what is [9]x[6]?

A 81 B 54 C 36 D 27 E 18

Question should read: 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]

Note that [] is just some function such that "[m]=3m when m is odd and [m]=(1/2)*m when m is even".

So, [m]=3m when m is odd, [m]=(1/2)*m when m is even. As 9 is odd then [9] equals to 3*9=27; As 6 is even then [6] equals to 1/2*6=3;

So [9]*[6]=27*3=81. Note that numbers in the answer choices are also in boxes, so we have: [m]=81. m could be 27 (in this case as 27 is odd [27]=3*27=81) OR 162 (in this case as 162 is even [162]=162/2=81) --> only [27] is in the answer choices.

Re: For all positive integers m, [m]=3m when m is odd and [m]= [#permalink]
16 Jun 2014, 02:07

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