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