Some Grid Fill puzzles have multiple solutions. Can you use one solution to find others without starting over from scratch?
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Pulling the napkin out from under all five of these sugar shakers would be a sweet trick. But is it even possible?
Series 2 of 2
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These rectangles are overlapping like a Venn diagram, so why not use Venn diagram strategies to find the shaded area?
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Sometimes area problems require careful calculation with formulas. Sometimes, though, there's another approach…
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The confusion of the inverse is the conflation of two related conditional probabilities. Today, you'll see how it applies to medical testing.
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There are more than a dozen gears in this gear train. Can you spot an easy way to compare the output gears?
Series 3 of 3
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In this puzzle, three conditions tell you where the pieces can go. Use the clues to narrow down the possible arrangements.
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