A man has to invite six of his friends on his birthday for dinner. he can send invitations by post, by phone or by his servant. in how many ways can he send invitations to his friends so that each of his friends gets only one invitation?
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Given that a gentle man has 6 friends to invite but he send invitations to them if he has 3 different couriers. He send a invitation to one of his friend in 3 different ways. Similarly he send invitations to them if he has 3 different couriers = 3 x 3 x 3 x 3 x 3 x 3 = 36 ways.
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