Question:
One of twelve pool balls is a bit lighter or heavier (you do not know) than the others. At least how many times do you have to use an old balance-type pair of scales to identify this ball?
(a) 1
(b) 3
(c) 7
(d) 12
One of twelve pool balls is a bit lighter or heavier (you do not know) than the others. At least how many times do you have to use an old balance-type pair of scales to identify this ball?
(a) 1
(b) 3
(c) 7
(d) 12
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