For all positive integers m, [m]=3m when m is odd and [m]=(1/2)*m when m is even. What is [7]*[4] equivalent to?
Choose the most appropriate option:
A) [28]
B) [84]
C) [42]
D) [48]
E) [14]
[7]*[4] = 21*2= 
<gadget id="calculator">21*2</gadget>
<output>42</output>
42= (1/2)(84) = [84]   The answer is [84].
<result>B</result>
For all positive integers m, [m]=3m when m is odd and [m]=(1/2)*m when m is even. What is [7]*[4] equivalent to?