1.

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

Answer»

How many different selections of 4 books can be made from 10 different books, if

(i) There is no restriction ;

(ii) Two particular books are always selected ;

(iii) Two particular books are never selected ?



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