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. $\frac{15!}{2!4!{\left(3!\right)}^3}$ b. $\frac{16!}{{\left(2!\right)}^{2}4!{\left(3!\right)}^3}$ c. $\frac{17!}{2!4!{\left(3!\right)}^3}$ d. $\frac{15!}{4!{\left(3!\right)}^3}$

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