Question

Please help! I’m really stuck.

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)?

Answer 1

The question that you asked is kind of confusing but I think that I have it.

Explanation:

So, as you said Marvin moves by a 1 by 1. 1 to the right and then 1 up. But there is an obstacle at (4,3). To evade that obstacle I would suggest going up four, and then over 1. To be honest, there are a ton of ways. All you have to do is just steer clear of (4,3).