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Jun 23, 2021
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Find the number of paths from P to Q, where each step is to the right or up.

 

Answer here: https://www.quora.com/What-is-the-number-of-paths-from-P-to-Q-where-each-step-is-to-the-right-or-up

 

1. Number of permutations of rruuu   (2+3)!2!3!=5!2!3!=10

 

2. Number of permutations of rrrruuu  (4+3)!4!3!=7!4!3!=35

 

 

So in total there are 1035=350 paths

 

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Jun 23, 2021
Jun 22, 2021

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