Mathematicians' Casino
Puzzle 6: Primes
| Difficulty: |    | | Fun: |    | | (based on 17 votes) |
Over to your left, you spot the Primes table. Primes is unlike any regular casino game. The dealer draws three from a pool of only eight cards: a red 2, 3, 5 and 7, and a black 2, 3, 5, and 7. She then will lay some number of the rest of the cards face up on the table, and make a true statement. The challenge is to guess whether the three cards in her hand add up to a prime number or not. Are you ready to play?
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