If you have 100 unbiased coins and one of them is defective. You have a weighing balance to check the weight of the coins. What is the minimum number of times you need to weigh the coins to identify the defective coin?
Anonymous
1y
1 defective coin then weigh that defective coin once
Anonymous
1y
5 times
1st 33 +33 + 33 +1
2nd 11 + 11 + 11
3rd 3 + 3 + 3 + 2
4th 3 + 3 (2+1 from 1st)
5th 1+1+1
Anonymous
2y
23 coins are the same weight, but 1 coin is either heavier or lighter. All you are given is a set of BALANCE scales, which can compare the weight of any two
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