2. Which of the following is the WRONG way to write C(10,3)?

A: (10P3)/3!

B:(10P3)/7!

C: 10!/(7!3!)

D: 10!/(3!7!)

3. There are 10 males and 11 females in your class. How many ways can you make a group of 4 students if there must be 2 males and 2 females?

4. A coach has 8 novice players and 12 experienced players. In how many ways can the coach make a group of 5 players if he must have at least 3 experienced players in any particular group?

5. Which is the total number of arrangements of the digits 1,2,3,4,5 if the even digits must not be together?