You have 8 identical-looking balls. One is slightly heavier. With a balance scale, what is the fewest weighings needed to find it?
Hint: Don't split into halves.
Two weighings.
Weigh 3 against 3. If they balance, weigh the last 2 against each other. If not, take the heavier 3 and weigh 1 against 1. Either way, two weighings are enough.
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