Question

There are 4 different routes a student can bike from his house to school. In how many ways can he make a round trip if he uses a different route coming than going
4! ?

Answer 1

12

Answer 2

1st2nd,1st3rd,1st4th,
2nd1st,2nd3rd,2nd4th
3rd1st,3rd2nd,3rd4th
4th1st,4th2nd,4th3rd

Answer 3

4P2=4!/(4-2)! = 4*3 =12

Answer 4

raheen,good explain ty