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A man has 7 friends. In how many ways he can invite one or more of them for a tea party
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Verified Answer
The correct answer is:
$127$
Required number of ways $=2^7 - 1 = 128$.
$\{$Since the case that no friend be invited i.e., ${ }_7 C_0$ is excluded}.
$\{$Since the case that no friend be invited i.e., ${ }_7 C_0$ is excluded}.
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