A person has got 15 acquaintances of whom 10 are relatives .In how many ways he may invite 9 guests so that 7 would be relatives?

A person has got 15 acquaintances of whom 10 are relatives . In how many ways he may invite 9 guests so that 7 of them would be relatives ?

A persons has got 12 friends of whom 8 are relatives. In how many ways can he invite 7 guests such that 5 of them may be relatives ?

A person has 15 friends of whom 10 are relatives. In how many ways can he invite 12 guests such that 8 of them are relative?

A perosn has 12 friends of whom 8 are reltives. In how many wys can he invite 7 friends such that at least 5 of them may be relatives?

A person has 12 friends out of which 7 are relatives. In how many ways can he invite 6 friends such that at least 4 of them are relatives?

A man has 10 friends. In how many ways he can invite one or more of them to a party?

A man has 10 friends. In how many ways he can invite one or more of them to a party?

A man has 10 friends, in how many ways he can invite one or more of them to a party?