A man has 6 friends. In how many ways ca...

A man has 6 friends. In how many ways can he invite two or more to a dinner party ?

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A man has 6 friends. He can invite 2 or more of his friends to a dinner party.
`:.` He can invite 2,3,4,5
or 6 of his friends in ` ""^6C_2+ ""^6C_3+ ""^6C_4+ ""^6C_5 = ""^6C_6 =2^6- ""^6C_0- ""^6C_1`
`=64-7=57"ways."`

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