You are given eight jelly doughnuts. The doughnuts all weigh the same amount except for one which is heavier. You have a balancing scale at your disposal. What's the minimum number of weighings required for you to pick out the heavy doughnut every time?

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3. split them into two equal piles, then split the heavier one, etc

I agree with 3. However, I would like to add that you should eat the pile of lighter ones after each weighing, just to make sure they aren't in the way or course.

another doughnut

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