Suppose you have four cards labeled with the letters A and D and the numerals 3 and 6. The rule of the game is that a card with a vowel on it always has an even number on the other side. Which of the cards would you have to turn over to prove this rule to be true?
What about:-
Suppose four people are drinking in a bar. One is drinking Coke. One is sixteen. One is drinking beer and one is twenty-five. Given the rule that no one under twenty-one is allowed to drink beer, which of those people's IDs do we have to check to make sure the law is being observed?
Brain Teaser
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Answer:
1) Two. The A card and the three card.
2) The beer drinker and the sixteen-year-old.
But why?
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