In how many ways 7 members forming a committee out of 11 be selected so that 3 particular mimbers must be included ?

In how many ways 5 members forming a committee out of 10 be selected so that 2 particular members must be included ,

In how many ways 5 members forming a committee out of 10 be selected so that 2 particular members must not be included.

In how many ways can 5 members forming a committee out of 10 be selected so that : two particular members must be included?

In how many ways can 5 members forming a committee out of 10 be selected so that : two particular members must not be included ?

In how many ways can 5 members forming a committee out of 10 be selected so that : (i) two particular members must be included (ii) two particular members must not be included ?