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Explanation:

f(mn) = f(m) × f(n)

f(1), f(2) & f(3) are positive integers.

Now we know, f(24) = 54

So, f(2) × f(3) × f(4) = f(2) × f(3) × f(2)2 = 54

f(3) × f(2)3 = 54

Also, we know, 54 = 2 × 33

Therefore, f(2) = 3, f(3) = 2

Now, f(18) = f(3)2 × f(2)

f(18) = 22 × 3 = 12

Hence, 12.

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