25 bikes are running between two places A & B. In how many ways can a person go from A to B and return by a different bikes?	Choose the correct choice from the following answers
A) 200  B) 250  C) 400  D) 600  E) 650
He can go in any car out of the 25 cars.   Hence He can go in 25 ways.   Since he can not come back in the same car that he used for travelling,   He can return in 24 ways.   Total number of ways = 25 x 24 = 600   600
<result>D</result>
25 bikes are running between two places A & B. In how many ways can a person go from A to B and return by a different bikes?