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A man has 10 friends. In how many ways he can invite one or more of them to a party
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Verified Answer
The correct answer is:
$2^{10}-1$
Required number of ways $=2^{\wedge} 10-1$
(Since the case that no friend be invited i.e., ${ }_{10} C_0$ is excluded)
(Since the case that no friend be invited i.e., ${ }_{10} C_0$ is excluded)
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