The function f is defined for all positive integers n by the following rule: f(n) is the number of positive integers each of which is less than n and has no positive factor in common with n other than 1. If p is any number then f(p) =
(a) p-1
(b) p-2
(c) $$\frac{p+1}{2}$$
(d) $$\frac{p-1}{2}$$
(e) 2
OA is A
Can an Expert give me the mathematical approach to solve this question? Thanks in anticipation
(a) p-1
(b) p-2
(c) $$\frac{p+1}{2}$$
(d) $$\frac{p-1}{2}$$
(e) 2
OA is A
Can an Expert give me the mathematical approach to solve this question? Thanks in anticipation
