Good morning to all

10 passengers that are considered distinguished, find itself in a bus and remain 3 attitudes (StA, StB, StC)

A.With how many ways they can get off from the bus all the passengers if in each bus stop it's possible to get off from no one up to 10 passengers?

V. With how many ways they can get off from the bus all the passangers if they have to get off 4 in two any bus stop and 2 in the other?

G. With how many ways they can get off all of the bus if they have to get off 4 in the StA or 4 in the StB( however they can not get off 4 in the two simultaneously)?

In all the questions will not be taken into consideration the order of geeting off the passangers from the bus