Consider a grid that has 3 rows of 4 squares in each row with the lower left corner named A and…

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Consider a grid that has 3 rows of 4 squares in each row with the lower left corner named A and upper right corner named B. Suppose that starting at point A you can go one step up or one step to the right at each move. This is continued until the point B is reached. How many different paths from A to B are possible? I thought about using a tree diagram starting from point A. From point A there are 2 ways to reach the points up and to the right. So I multiply 2 when I reach each point. I don’t know how to continue from the upper left and lower right corners.

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