there are 6 routes for journey from station a to b . in how many ways you may go from a to b returning you make a choice of any routes
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no of ways for going A to B=6
no of ways of returning from B to A =6
total number of ways for going and returning= 6x6=36
no of ways of returning from B to A =6
total number of ways for going and returning= 6x6=36
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