This question is from MBA.com practice test 2:
I do not understand how to solve it but the answer is the first choice.
Thanks!
I do not understand how to solve it but the answer is the first choice.
Thanks!
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You have to find the number of co-primes here.
Take p = 5, for example. We know prime number p does not have any
factors other than 1 and p. Since f(p) includes numbers < p, we have
f(p) = 1, 2, 3, 4. So, f(p) will be p - 1.
