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: 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
a1175
aeks123
alyse816
bmdpiano
chancetoremember
chippy1313
dancestar10
davidbdale
dunkindonuts10
dupreeh79
Cleo
gossipgirl3801
greeneggsandham234
harp03
j6128
killerbeanforever
kingoflizards
krustykrabpizza7
nayr79
nickalodeansallthat
omgmafia
romanhsantiago
rose1029
samtheman1448
shaquilleoatmeal2250
Shiloh Vasko
sixers103
starbucks732
stripedsweater21
studentwriter1212
taxmanmaxwell
tenere84
More Money Maintenance
therealjohnsanchez
torthey
walmaarts
wentzwagon11
Counterintuitive 
just two (red and blue)
Just two cards: Red and Yellow
Red Card only
Red Card only
Red and yellow because they are the even and vowel cards that we are worried about. The e=odd and constant cards we don’t need to flip over
Red and Blue
You could choose either Red and Green or Red and Blue
Red and yellow because red is a vowel an yellow is an even number, so if we turn them over we can see is the red has an even number and the yellow is a vowel.
Three cards: Red, Green, Yellow. We would need to see if the red card that has “E” has an even number. Next, we would need to see if the green card with the “G” has an odd number; there’s a chance that the green card could have an even number also. Last, we would need to see if the yellow card has a vowel on the opposite side.
Red and Yellow
red and yellow cards
Red Green Yellow Blue – I was going to say Red and Yellow. Those two cards fit the criteria of the hypothesis, being a vowel and an even number. However, turning over the other cards will prove the hypothesis true. It is possible that the other cards could prove the hypothesis false.
never mind
red and yellow
red and yellow because the yellow card is an even number and the letter e is a vowel
Red and Yellow
You must flip over 2 cards, red and yellow to prove that the cards both have vowels and even numbers
Just two red and yellow, red has a vowel and yellow is an even number
I believe it’s the red and yellow cards because the hypothesis is that all the cards with vowels have to also have an even number. It doesn’t say anything about the other cards and if it is a even number and not a vowel.
Just the red card only
red and blue