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  4. A and B stand in a ring along with 10 other persons. If the arrangement is at random, the probability that there are exactly 3 persons between A and B, is

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Q. $A$ and $B$ stand in a ring along with 10 other persons. If the arrangement is at random, the probability that there are exactly 3 persons between $A$ and $B$, is

Probability - Part 2

Solution:

Take any three person among 10 person between A and B

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