I want to go from $(0,0)$ to $(8,8)$ in this $8\times8$ grid. I can only move up or right.
However, I have to avoid the points $(3,3), (3,4), (4,3), (4,4)$ ($a,b,c,d$ in the figure). How many distinct paths are possible?
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1What have you tried? – Calvin Lin Mar 04 '20 at 07:41
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We are not here to blindly answer your homework questions. You are more likely to get answers if you show what you have already tried first. – lioness99a Mar 04 '20 at 08:12
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This is the third time in a short while that this has been asked – what's the source? – joriki Mar 04 '20 at 08:14