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Six persons A, B, C, D, E and F are to b...

Six persons A, B, C, D, E and F are to be seated at a circular table. In how many ways can this be done, if A must always have either B or C on his right and B must always have either C or D on his right?

A

a) 18

B

b) 27

C

c) 81

D

c) 9

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