Three friends Roger, Djoko and Rafael (:p) went to watch a tournament of tennis on a certain day of the event, when a total of 7 matches were being held (no match-timings coinciding with any other). All the 3 friends can either watch a match or loiter around in the arena with the probability ratio (3:1) On entering the arena, all 3 went their separate ways. Find the probability of none of them having witnessed any particular match together.

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:( I can't solve it, @foolformath HELP.

nahii.. ISHAAN, ye naaahhiii ho saktaa!! :p :D

I can't also.

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