in 80 coins one coin is counterfiet what is minimum number of weighings to find out counterfiet coin?

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in 80 coins one coin is counterfiet what is minimum number of weighings to find out counterfiet coin?

2006-09-21 01:25:50 · 3 answers · asked by mohit 2 in Education & Reference ➔ Higher Education (University +)

3 answers

first 40:40
second 20:20
third 10:10
fourth 5:5
fifth 2:2 until they balance
so 5 is the answer

2006-09-21 01:32:56 · answer #1 · answered by toietmoi 6 · 0⤊ 0⤋

2006-09-21 01:56:46 · answer #2 · answered by friedpaw 2 · 0⤊ 0⤋

if you know whether the coin is lighter or heavier than the real coins, and you get lucky, then 5 is the minimum. & if you don't know, then 6. The maximum if you don't know would be 8.

2006-09-21 01:34:23 · answer #3 · answered by vmmhg 4 · 0⤊ 0⤋