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If the total number of selection that can be made from n different books each having 5 copies taking atleast 2 copies of each book is 256, then n is required equal toA) 3. B) 4.C) 5. D) none of these

If the total number of selection that can be made from n different books each having 5 copies taking atleast 2 copies of each book is 256, then n is required equal toA) 3. B) 4.C) 5. D) none of these

Grade:11

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