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29 Aug 2006, 07:02
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Why is the answer not 81? 
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29 Aug 2006, 08:19
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This problem is confusing when read in a hurry.
Given (f is the function specified)
f(m) = 3m when m is odd
f(m) = m/2 when m is even
f(9) = 3x9 =27 as 9 is odd
f(6) = 6/2 = 3 as even
Therefore f(9) x f(6) = 27 x 3 = 81.
The answer A is f(81) = 3x81 = 243 not just 81.
Therefore, 81 is not the correct answer.
What you are looking for is f(x) = 81
As 81 = f(27) { as 27 x 3 = 81}
OR 81 = f(162) { as 162/2 = 81 }
x could be : 27 or 162
Only f(27) is an option....
Answer: E. f(27)
Given (f is the function specified)
f(m) = 3m when m is odd
f(m) = m/2 when m is even
f(9) = 3x9 =27 as 9 is odd
f(6) = 6/2 = 3 as even
Therefore f(9) x f(6) = 27 x 3 = 81.
The answer A is f(81) = 3x81 = 243 not just 81.
Therefore, 81 is not the correct answer.
What you are looking for is f(x) = 81
As 81 = f(27) { as 27 x 3 = 81}
OR 81 = f(162) { as 162/2 = 81 }
x could be : 27 or 162
Only f(27) is an option....
Answer: E. f(27)
