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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 his home at (4,6).  However, at (2,4) here is a frog that will eat him if he goes through that point.  In how many ways can Marvin reach his home?

 Dec 5, 2022
 #1
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Using the Pascal Triangle method.

 

0    1     1    1    1    

1    2     3    4    5

1    3     6   10   15 

1    4    10  20   35   

1    5    X    20   55

1    6    6    26   81

1    7   13  39  120

 

Therefore the answer is 120.

 

(Please tell me if I did anything wrong) coolcheekylaughwink

 Dec 5, 2022
 #2
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That answer is wrong.

Guest Dec 5, 2022

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