Natasha and Naomi are performing their favorite magic trick for some friends. In front of them is a
standard deck of 52 facedown cards. They invite a friend (who is not "in" on the trick) to shuffle the
deck and then select five cards to give to Naomi. Naomi looks at the five cards, chooses one (which she
puts facedown in front of her), then arranges the remaining four cards in any order she wants and hands
them to Natasha. Natasha looks at the four cards and then correctly names Naomi's card. Can you figure
out how the two girls peformed the trick?
This is not a trick question. It wasn't a lucky guess, the cards are not marked, Naomi did not
communicate the card she selected verbally or through gestures, the card was not secretly switched with
some other card, there is no hidden camera in the surface Naomi places her card on, and Natasha never saw
Naomi's card. The "trick" has to do with how Naomi chooses which card to select and the
order of the four cards that are handed back to Natasha.
Do you have a suggestion
for this puzzle (e.g. something that should
be mentioned/clarified in the question or solution, bug, typo, etc.)?