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In how many ways can 17 persons depart f...

In how many ways can 17 persons depart from railway station in 2 cars and 3 autos, given that 2 particular persons depart by the same car (4 persons can sit in a car and 3 persons can sit in an auto)? a. `(15 !)/(2!4!(3!)^3)` b. `(16 !)/((2!)^2 4!(3!)^3)` c. `(17 !)/(2!4!(3!)^3)` d. `(15 !)/(4!(3!)^3)`

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