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Puzzle of the Day

These puzzles are also printed in Eight days a week, a booklet published by the Association of Teachers of Mathematics.The Association of Teachers of Mathematics

Dominoes have 0, 1, 2, 3, 4, 5, or 6 spots on each end and there is only one domino for each possible combination. How many dominoes are there in a normal set of dominoes?

Answer: 2


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