A and B stand in a ring with 10 other pe...

A and B stand in a ring with 10 other persons . If the arrangement of the twelve persons is at random , find the chance that there are exactly three persons between A and B.

`(1)/(11)`

`(2)/(11)`

`(3)/(11)`

`(4)/(11)`

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The correct Answer is:

(b)

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