Combinatorics 2
Probability
Level
2
In how many ways can 4 persons holding a five-rupee note each and 4 persons holding a ten-rupee note each queue up for buying tickets, one each, if the booking clerk starts with an empty cash box and the price of a ticket is Rs.5?
8064
1438
8008
8094
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1 solution
The solution is nothing but the 4th Catalan Number...