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8 balls the same size; one is heavier than others; how many times do you need to use a balance scale to find the ball? How many times if you don't know whether the ball is heavier or lighter? Light bulb in a room; three switches outside the room; can only go into the room once; how do you find which switch goes to the light?
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Intern

Interviewed at Cisco

4.1★
Nov 12, 2014

8 balls the same size; one is heavier than others; how many times do you need to use a balance scale to find the ball? How many times if you don't know whether the ball is heavier or lighter? Light bulb in a room; three switches outside the room; can only go into the room once; how do you find which switch goes to the light?

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