The Card Hypothesis

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

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

The test
Which card or cards must we turn over in order to test the Hypothesis?

Card Hypothesis

The 15 possible answers are:

All four cards: G 2 3 E
Three cards: G 2 3 / G 2 E / G 3 E / 2 3 E
Just two cards: G and 2 / G and 3 / G and E / 2 and 3 / 2 and E / 3 and E
Just one card: Card G only / Card 2 only / Card 3 only / Card E only

Select one of the 15 answers and type it just as it is typed in the list above.
Type your answer in the Reply field below and Save.

38 Responses to The Card Hypothesis

  1. Valcom says:

    Flip cards 2 & E only


  2. flip card E because card E is a vowel and takes the least amount of work, instead of flipping all of them.


  3. lovericeandnoodles says:



  4. hershey515 says:

    G and E/2


  5. smellycat23 says:

    Card E only


  6. Anonymous says:

    G 2 3 E


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