Riddle
A rubber ball is tossed off the top of a 90 foot building. Every time it bounces, it goes back up half way. How many bounces will the ball take before it stops?
Try it first, then reveal and read the payoff.
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Answer
Take a moment to solve it, then reveal the answer below.
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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