21. Consider the grid of points shown below. Suppose that starting at the point labeled A you...
Question:
21. Consider the grid of points shown below. Suppose that starting at the point labeled A you can go one step up or one step to the right at each move. This is continued until the point labeled B is reached. How many different paths from A to B are possible?
HINT:
Note that to reach B from A you must take 4 steps to the right and 3 steps upward.
A B
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