Maximum Value of nCr

Q.

A person wishes to make up as many different parties as he can out of 20 friends with the condition that each party consists of the same number. How many should he invite at a time?

1. 5
   

2. 10
   

3. 15
   

4. 20

Q. A person wishes to make up as many different parties as he can out of 20 friends with the condition that each party consists of the same number. How many should he invite at a time?

1. 5
2. 10
3. 15
4. 20