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There are 12 different books on a shelf. In how many ways we can select atleast one of them.

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There are 12 different books on a shelf. In how many ways we can select atleast one of them.

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We may select 1 book, 2 books,........, 12 books. 

∴ The number of ways = 12C1 + 12C2 + ....... + 12C12 = 212 – 1 = 4095

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