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Question

Question: A man has 7 friends. In how many ways he can invite one or more of them for a tea party....

A man has 7 friends. In how many ways he can invite one or more of them for a tea party.

A

128

B

256

C

127

D

130

Answer

127

Explanation

Solution

Required number of ways = 271=1272^{7} - 1 = 127.

{Since the case that no friend be invited i.e., 7C07C_{0} is excluded}.