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Question

A shopkeeper has 10 copies of each of nine different books, then number of ways in which at least one book can be selected is

A
9111
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B
10101
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C
1191
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D
109
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Solution

The correct option is C 1191
B110 B210 B310B910
Selection of atleast one book
(10+1)(10+1)(10+1)9 times1=1191

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