# 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?

Type your answer in the Reply field below and Save.
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

## 43 thoughts on “Card Hypothesis Puzzle”

1. todayistheday19 says:

All four cards

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2. rainbow987 says:

Cards A and C

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3. thebeard1 says:

Turn over all four cards.

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4. yoshi189 says:

All four cards

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5. theintern50 says:

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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8. plethoragaming says:

Just 2 cards, A and C

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9. splash305 says:

Turn over all four cards

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10. killroy513 says:

Card C only

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11. pdqlover20 says:

All four cards

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12. chandlerbing27 says:

All four cards

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13. lifeissublime13 says:

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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14. flyerfan1974 says:

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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15. neweditionlover says:

I believe all cards

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16. unknowntrendsetter says:

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

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17. phillygirl20 says:

test only card A or card B

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

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19. Knuckles the Enchilada says:

A and C only

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20. myrtleview says:

All four cards

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21. paulajean5 says:

All four cards.

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22. doublea413 says:

flip card A and C

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23. thenaturalist201 says:

A and C

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24. pATricKStar123 says:

both A and C

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25. dancers8 says:

All four cards need to be turned over

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26. amongothers13 says:

Turn over all the cards.

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27. dohertyk9 says:

All four cards.

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1. dohertyk9 says:

Actually ACD, only three cards.

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28. summergirl1999 says:

Cards A and C

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29. lbirch141 says:

All four cards

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30. picklerick13 says:

Cards A and C

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31. tjjones132 says:

Turn over all four cards.

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32. ReputedDog says:

All 4 cards.

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33. Anonymous says:

All four cards

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34. dudeintheback says:

Card a and c

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35. moonlightsonata42 says:

Cards A and C

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36. Popper says:

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

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