# Card Hypothesis Puzzle

**FACT:** Each card has a number on one side and a letter on the other.

**HYPOTHESIS: **Every card that has a vowel on one side has an even number on its opposite side.

**THE TEST:** Which card or cards must you turn over in order to test the Hypothesis?

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The 15 possible answers are:

**All four cards:** A B C D

**Three cards:** A B C / A B D / A C D / B C D

**Just two cards:** A and B / A and C / A and D / B and C / B and D / C and D

**Just one card:** Card A only / Card B only / Card C only / Card D only

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All four cards

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A and B

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Cards A and C

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Turn over all four cards.

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All four cards

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Cards A and C

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Turn over cards A and C

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All four cards

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Just 2 cards, A and C

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Turn over all four cards

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Card C only

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All four cards

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All four cards

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I think that Card A and Card C should be turned over. This will test the hypothesis because they are the cards with a vowel and an even number.

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All 4 Cards need to be turned over to see if there is an even number behind E, and odd behind G, a vowel being 2, and a consonant behind 3.

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C D A

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I believe all cards

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Turn over all four cards to see if it has a vowel or an even number on the other side

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test only card A or card B

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If I ask again on Wednesday, will you remember which cards need to be turned over and why? 😉

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A and C only

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All four cards

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All four cards.

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A and C only

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flip card A and C

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A and C

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both A and C

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All four cards need to be turned over

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Turn over all the cards.

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All four cards.

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Actually ACD, only three cards.

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Cards A and C

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All four cards

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Cards A and C

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Turn over all four cards.

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All 4 cards.

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All four cards

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Card a and c

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Cards A and C

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A and D. Those are the only cards with which to falsify the hypothesis. If A (E) has an even number and D (3) a consonant, the hypothesis stands. Cards B and C prove nothing either way – at most they confirm a bias.

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Surprised to see Karl Popper is still alive . . . or remembered. 🙂

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A, C, D

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Why C, Mysterion?

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