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Q.
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
E.
None of the above
View Answer
Correct choice: C
Explanation:
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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