SOLUTION: A man has 3 friends .In how many was can he invite one or more of them to dinner

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Question 504611: A man has 3 friends .In how many was can he invite one or more of them to dinner
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
There are 2^3 = 8 ways for the man to invite 0, 1, 2, or 3 friends. We subtract the number of ways to invite none of his friends which would be 3C0 = 1) to obtain 7 ways.