Can't crack it. Please help:
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 prime number then f(p) =
A) p - 1
B) p - 2
C) (p+1)/2
D) (p-1)/2
E) 2
Correct answer is A). Thank you!
yeah - it's CAT2
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 prime number then f(p) =
A) p - 1
B) p - 2
C) (p+1)/2
D) (p-1)/2
E) 2
Correct answer is A). Thank you!
yeah - it's CAT2
