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If there are only a handful of objects, then you can count them with a moment's thought, but the techniques of combinatorics can extend to quickly and efficiently tabulating astronomical quantities. See more

How many triangles can you find in this figure?

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How many triangles can you find in this figure?

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How many triangles can you find in this picture?

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How many triangles can you find in this figure?

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How many triangles can you find in this figure?

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