How many different selections of 6 books can be made from 11 different books, if
(i) two particular books are always selected.
(ii) two particular books are never selected?

How many different selection of 4 books can be made from 10 different books, if (i) Two particular books are always selected. (ii) Two particular books are never selected.

How many different selections of 5 books can be made from 12 different books if, (i) Two particular books are always selected ? (ii) Two particular books are never selected ?

How many different selections of 6 books can be made from 11 different book , if Two particular books are always selected ,

How many different selections of 6 books can be made from 11 different book , if Two particular books are never selected ?

How many different selections of 4 books can be made from 10 different books, if There is no restriction; Two particular books are always selected; Two particular books are never selected?

How many different selections of 4 books can be made from 10 different books,if There is no restriction Tow particular books are always selected; Two particular books are never selected?

How many selection of 4 books can be made from 8 different books?

How many selection of 4 books can be made from 8 different books?