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8 marbles are exactly alike except that one is slightly heavier than the others how do you determine the heavier marble in 2 weighings?
Gmnigrl1
Pick 6 marbles. Weigh 3 against 3.
If they balance, then weigh the other two against each other to find the heavier one.
If they don't balance, look at the three that are heavier. Pick 2 and weigh them against each other. If they balance, then the 3rd marble in that group is the heavier one. If they don't balance, you have the heavier one.
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