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Dear student what do you mean by x1x2x3. I did not get it. Please elaborate this. I will be happy to help you.
Dear student There are only three possible ways to reach (0,0) to(1,1)→3 up 3 down and 1 forward =6!/3!2!→1 up and 3 forward 2 backward =6!/3!2!→2 up 1 down and 2 forward 1 backward =6!/3!3!Adding the 3 we get6!/3!2! + 6!/3!2! + 6!/3!3! = 140 this the no. of ways is →140 × 3 = 420
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