[求助]请教两道数学题

请教两道prep数学题，这类题目我都不大会做

1.Six countries in a certain regaion sent a total of 75 presentatives to an international congress, and no two countries sent the same number of representatives of the six countries, if country A sent the second greatest number of representatives, did country A send at least 10 representatives?

1) one of 6 countries sent 41 representatives to congress

2) country A sent few than 12 representatives to congress

2.the function 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)=?

1）E？

2）P-1？

高级方法没有，列了几个数字凑