Ramesh has 6 friends. In how many ways can he invite one or more of them at a dinner? | 11 | PER...

Ramesh has 6 friends.In how many ways can be invite one or more of them at a dinner? (A) 61(B)62(C)63(D)64

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A person has 8 friends.The number of ways in which he may invite one or more of them to a dinner is.