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Set

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121
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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.

There is exactly one card for each possible combination of attributes.

In the game, several of the cards are dealt out, and the goal is to find a set. A set is formed by three cards, where for each attribute, either all three cards are the same, or all three cards are different.

So, I was wondering how many UNIQUE sets are there and please enter a text explanation. My first answer is \$4^4=256\$ but I'm not sure if I'm overcounting anything.

P.S. There are \$3^4=81\$ cards in a complete deck of Set. (Notice that the answer isn't undefined because there is only ONE card for each possible combination of attributes)

Jan 27, 2021
edited by MathSolverForLYFE  Jan 27, 2021

#1
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by at three sets are the same your talking about the same feature like same color?

Jan 27, 2021
#2
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There are 81/3 = 27 sets because there are 3 cards per set.

Jan 27, 2021
#3
+819
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I think it would be 4^4 since you can have them all different too. So for colour you can have red, purple, green, or all different.

=^._.^=

Jan 27, 2021