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Marvin the fly starts at (0,0). Each step, Marvin moves one unit right or one unit up. He is trying to get to the point (5,7). However, at (4,3) there is a frog that will eat him if he goes through that point. In how many ways can Marvin reach (5,7)?

 

Any hints or full explanations would be greatly appreciated. thanks in advance for those who answer!!!

 Jun 28, 2020
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There are 792 - 4*6 = 768 for Marvin to reach (5,7).

 Jun 28, 2020

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