A checker is placed on a checkerboard as shown. The checker may move diagonally upward. Although it cannot move into a square with a red square, the checker may jump over the X into the diagonally opposite square. How many path are there to the top of the board?
Understanding the Problem:
I am asked to determine the number of paths at the top of the board. This is calculated by determining the number of steps at each square.
Devise a Plan:
Pascal's method: Created by an iterative process, each term is equal to the term of the two terms immediately above it.
Carry out the plan:
Using Pascal's method, I will start by putting down the patterns that can only be made ONCE and considering the red squares as well which I cannot make a move:
Now, time to calculate the terms above by simply summing them:
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