1. In how many ways can I invite one or more of friends to a dinner? 2.8 friends shake hands mutually.Find the total number of handshakes.For each shake hand we need two persons.
He may invite one or more friends by selecting either one, two three, four, five or six out of the 6 friends. So total number of ways = 6C1 + 6C2 + 6C3 + 6C4 + 6C5 + 6C6
Thus, the answer will be 8C2 handshakes
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