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Among 10 persons, A, B, C are to spea...

Among 10 persons, A, B, C are to speak at a function. The number of ways in which it can be done if A wants to speak before B and B wants to speak before C is a. `10 !//24` b. `9!//6` c. `10 !//6` d. none of these

A

10!

B

10!/6

C

10!/7!

D

10!/2!

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