help me solve this

3. [-116.66 Points] DETAILS HUNTERDM3 4.4.004. MY NOTES Refer to Example 4.38. For each of the seven intersections in the figure, nd the probability that the customer passes through the intersection on the way to the bookstore. (Assume each direct path is equally likely and the customer only travels east and south.) p1= p2= p3= p4= p5= p6= p7= A shopping district with restaurant R and bookstore B