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  4. A train is going from London to Cambridge stops at 12 intermediate stations. 75 persons enter the train during the journey with 75 different tickets of the same class. Number of different sets of tickets they maybe holding is

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Q. A train is going from London to Cambridge stops at 12 intermediate stations. 75 persons enter the train during the journey with 75 different tickets of the same class. Number of different sets of tickets they maybe holding is

Permutations and Combinations

Solution:

Correct answer is (a) ${ }^{78} C _3$