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OpenStudy (anonymous):
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! ?
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OpenStudy (anonymous):
12
OpenStudy (anonymous):
1st2nd,1st3rd,1st4th, 2nd1st,2nd3rd,2nd4th 3rd1st,3rd2nd,3rd4th 4th1st,4th2nd,4th3rd
OpenStudy (anonymous):
4P2=4!/(4-2)! = 4*3 =12
OpenStudy (anonymous):
raheen,good explain ty
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