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The grid below is made up of line segments, like the line segment in red.

There are a number of paths that go from A to B in the grid, where every step goes to the right or up. If we choose a line segment at random, then what is the expected number of paths that pass through it?

 Dec 29, 2022
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I'm so disappointed. You didn't show us the "grid below". There's nothing below. Please reread your question before posting it on here, so you can check for mistakes.

 Dec 29, 2022

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