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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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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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