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⟩ In 80 coins 1 coin is counterfeit which is minimum no. of weighings to find out counterfeit coin?

split the coin into 26 26 26......

take any 2 26 coins.....

if it is = the odd coin isin remaining 26,

if any one has less or more wt, go for nxt and find it..

so it takes 2 trials.....

9,9,9

3,3,3

1,1,1.....

5 trials or 6 trials

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