(adsbygoogle = window.adsbygoogle || []).push({}); # of ways to go to the opposite corner.

Suppose m+1 parallel (laid N-S)roads cross n+1 parallel (laid E-W) roads. In how many different ways one can move from North- East corner (of crossing) to South- West corner heading either West or South? What the simplest / attractive way (explanation) to make students of age 17yr understand while teaching in class. I observed, students really do not get the logic.

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# Number of ways to go to the opposite corner.

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