help- equation

[hpgmat]

for all Positive integers m, [m] = 3m when m is odd and [m]= 1/2 m when m is even. which of the following is equivalent to [9] x [6] ?

[81]
[54]
[36]
[27]
[18]

please explain

[NikolayZ]

Hey there !

[9]=9*3, because 9 is odd.
[6]=6*1/2=3, because 6 is even.
Hence [9]*[6]=81
[27]=27*3=81.
Hence [9]*[6]=[27]