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psyopmonkey2 posted:Split the balls into two sets of 4. This solution always takes 3 weighings. You can alter this to take 2 weighings half the time and at most 3 weighings, which can be a big difference if you've got lots of balls rolling around. Split the balls into two sets of 4. Edge the second set aside for a moment (or possibly forever, you big tease). Split your first set of four into two pairs of balls and teabag either side of your scale. If one of your pairs is heavier, then one of those two is the ball you've been dreaming of. Your second weighing determines which one. Hence, half the time you finish yourself off in two weighings. If not, repeat the process with your second set of four balls. Before you get past 3 weighings you've emptied out your balls.
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Jul 17, 2015 21:17
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Jeffrey of YOSPOS posted:you can do it in two weighings guaranteed and the solution was already posted You caught me. Found me out. That cuts deep. Balls deep.
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Jul 17, 2015 22:10
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