Ten buses are plying between two places A and B. In how many ways a person can travel from A to B and come back? 

In how many ways 2 persons can be selected from 4 persons?

In how many ways 2 persons can be selected from 4 persons?

There are 10 buses running between two towns X and Y. In how many ways can a mango from X to Y and return by a different bus ?

If there are 20 buses playing between places A and B, in how many ways can a round trip from A be made if the return journey was made on: i. the same bus, ii. a different bus.

If there are 20 buses playing between places A and B, in how many ways can a round trip from A be made if the return journey was made on: i. the same bus, ii. a different bus.

If there are 20 steamers plying between places A and B, in how many ways could the round trip from A be made if the return was made on : the same steamer ?

If there are 20 steamers plying between places A and B, in how many ways could the round trip from A be made if the return was made on : a different steamer ?

There are 8 buses running from Kota to Jaipur and 10 buses running from Jaipur to Delhi. In how many ways a person can travel from Kota to Delhi via Jaipur by bus?