Subjects

• Mathematics and computing
• Science in culture

Imagine the scene. You are standing in front of an audience and hand a deck of playing cards to a randomly selected volunteer. Next, you ask the volunteer to cut the cards, remove the top five cards and hand each of the cards to five other members of the audience. You then announce that you are going to try a spot of mind reading. The five people are asked to look at their cards and stand up if they are holding a red card. You immediately name each of their cards and then, as a finale, also name the black cards being held by the remaining volunteers.

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