Rajdhani Express going from Bombay to De...

Rajdhani Express going from Bombay to Delhi stops at five intermediate stations, 10 passengers enter the train during the journey with 10 different ticket of two class. The number of different sets of tickets they may have is a. `^15 C_(10)` b. `^20 C_(10)` c. `^30 C_(10)` d. none of these

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