The function f is defined for all positive integers 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 prime number then f(p)= ??
(a) p-1
(b) p-2
(c) (p+1) / 2
(d) (p-1) / 2
(e) 2
I dont get why the answer is a, i thought it would be b
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 prime number then f(p)= ??
(a) p-1
(b) p-2
(c) (p+1) / 2
(d) (p-1) / 2
(e) 2
I dont get why the answer is a, i thought it would be b
