Riddle
How many 1 foot by 1 foot bricks would it take to complete a building that's 20 feet long on all four sides and 20 feet high?
Answer
Take a moment to solve it, then reveal the answer below.
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Answer
Only one; the last brick you put in will complete it.
Why it works
The trick is whether the situation repeats after the first step or the list counts the same item more than once.
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