Question

there are 20 buses playing between A& B in how many ways could the round trip from A be made of return was made by the same bus.​

Answer 1

Step-by-step explanation:

we can go in any bus out of the 20 buses.

Hence He can go in 20 ways.

If the return journey was made on same bus Since the return journey is made on same bus so, we can return in 20 ways.

Thus, total number of ways = 20×20 = 400

If the return journey was made on different bus

Since we can not come back in the same bus that he used for travelling,

we can return in 19 ways.

Thus, total number of ways = 20×19 = 380