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There are 9 chairs in a room on which 6 persons are to be seated, out of which one is guest with one specific chair. In how many ways they can sit:

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346

6720

60480

answer is A.

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Detailed Solution

5 persons are to be seated on 8 chairs ${i.e.}^{8} C_{3} \times 5!$ or 6720.

{Since 5 chairs can be select in $^{8} C_{5}$ and then 5 persons can be arranged in 5 ! ways}.

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