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by post, by phone or by his servant

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by sanju09 » Tue Apr 27, 2010 2:11 am
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?
(A) 120
(B) 216
(C) 720
(D) 729
(E) 4320
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by liferocks » Tue Apr 27, 2010 3:57 am
for each of the friend he has 3C1 or 3 ways to send invitation.
hence total number of ways to send each friend only one invitation is
3*3*3*3*3*3=3^6=729

Ans option D
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