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=Quick Thinking Tests=


9 coins,one of them is fake. Use a balance to weigh them not more than 3 times and find the fake. A fake coin is not necessarily lighter.

split coins into 3 groups.
Initially after taking 3 groups of 3 coins each, in the first attempt to weigh 2 groups, we can find in which group that coin exists. In 2nd attempt we can weigh two coins out of 3, in this attempt itself we will be able to find out which coin it is. i.e., in two attempts we should be able to find out.