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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 facing towards the centre. Then the number of ways that can be done if A must have either E or F on his immediate right and E must have either F or D on his immediate right, is

A

18

B

30

C

12

D

24

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A
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