Homework Answers
a)
Number of paths =n
Number of ways to have 5 east and 4 steps north
Then n=9!/(5!*4!)=126
B)
Number of paths=N
4steps to east and 1 step to coffee shop*N(1 step east and 3 stops North to point B)=(5!/(4!*1!))*(4!/(1!*3!))=5*4=20
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