A train time table must be compiled for various days of the week, so that two trains twice a day depart for three days, one train daily for two days, and three trains once a day for two days. How many diferent time table can be compiled?

Explanation

1 train 3 days, number 2=>2 days

number 3 train=2

`(7!)/(3!2!2!)`

`(7*6*5*4*3*2)/(3*2*2*2)`

`30*7`

`210`.