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How many unique sets are there? When three cards form a set, we can also count the number of attributes for which all three cards are the same. In the card game Set, each card features a number of shapes, with four attributes: Number: The number of shapes is 1, 2, or 3. Color: Each shape is red, purple, or green. Shape: Each shape is oval, diamond, or squiggle. Shading: Each shape is hollow, shaded, or solid. There is exactly one card for each possible combination of attributes.

 Mar 13, 2021
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There are 81/3 = 27 unique sets.

 Mar 13, 2021

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