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 QUESTION: Which card or cards must you turn over in order to test the Hypothesis?
EXTRA CREDIT: Is it easier to prove a Hypothesis True or False?
Type your answer(s) in the Reply field below and Save.
The 15 possible answers to the first question are:
All four cards: Red Green Yellow Blue
Three cards: Red Green Yellow / Red Green Blue / Red Yellow Blue / Green Yellow Blue
Just two cards: Red and Green / Red and Yellow / Red and Blue / Green and Yellow / Green and Blue / Yellow and Blue
Just one card: Red Card only / Green Card only / Yellow Card only / Blue Card only
The Gamer 2.0
SleepyCat
Coffee Lover 03
doglover7025
Snowman10
excellentstudent27
Gymrat
hockeyfan
holistic25
ilovebeesss
ilovemydog
The Gamer
Naturechild101
BreakingBad45
ravensfan8
temporal111
thatpersonoverthere
toetio
username1132005
Calm&Patient
webbwrestler135
Counterintuitive Spring 2024 
it’s easier to prove it false.
You have to turn them all over.
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two cards red and yellow
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Just two cards: Red and Yellow
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just 2 cards, red and yellow. its easier to prove it false
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wait nevermind, all four cards
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red and yellow cards
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Just two cards. Red and yellow.
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It is easier to prove a hypothesis false.
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All four cards
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Just two cards: The red and yellow card
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It’s easier to prove it’s false
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Two cards: Red and yellow
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all four cards
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All four cards. It is easier to prove this hypothesis false because you only need one instance of it being false. If you were to prove it true you need every instance of your hypothesis to be true.
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Just the yellow card!
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To test the hypothesis effectively, you should turn over the Green Card (G, 3) because it has a vowel on one side but an odd number on its opposite side, potentially refuting the hypothesis.
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the red and yellow cards, 2 cards
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two cards, red and yellow
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Red Green Yellow Blue.
It is easier to prove the hypothesis false.
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The red and yellow ones
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