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 = 27−1=127.
{Since the case that no friend be invited i.e., 7C0 is excluded}.