Permutations And Combinations Question 81

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

Options:

A) 128

B) 256

C) 127

D) 130

Show Answer

Answer:

Correct Answer: C

Solution:

  • Required number of ways = $ 2^{7}-1=127 $ . {Since the case that no friend be invited i.e., $ ^{7}C_0 $ is excluded}.

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