SOLUTION: for a boy having 6 friends how many ways are there to invite 1 or more of them to the lunch?

Question 301994: for a boy having 6 friends how many ways are there to invite 1 or more of them to the lunch?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
for a boy having 6 friends how many ways are there to invite 1 or more of them to the lunch?
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#(at least one) = 1 - #(none)
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Number of ways to invite any number from 0 to 6 = 2^6 = 64
Number of ways to invite none of the 6: 1
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Number of ways to invite at least one: 64-1 = 63
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Cheers,
Stan H.
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