You have eight balls all of the same size …
Take 6 of the 8 balls and put 3 on each side of the scale. If the heavy ball isn’t in the group of 6, you know it’s one of the remaining 2 and so you put those two in the scale and determine which one. If the heavy ball is in the 6, you have narrowed it down to 3. Of those 3, pick any 2 and put them on the scale. If the heavy ball is in that group of 2, you know which one it is. If both balls are of equal weight, then the heavy ball is the one you sat to the side.
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