mathematics - 1 Fake Coin among N Amount of coins - Puzzling Stack Exchange

You are given $N$ coins which consists of only $1$ fake coin. You also have a sensitive old-fashioned Pan Balance Scale. You are asked to find the fake coin in totally 5 times weighing on the Pan

Hard Logic Puzzle - Find 1 fake coin from 9, but using the scale only 3 times

One out of three identical coins is fake. We know that the fake coin is a different weight from the real coins. Using a scale, what is the minimum number of weighing

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mathematics - 10 coins, 3 of them are fake - Puzzling Stack Exchange

536 Puzzles and Curious Problems (Dover Puzzle Books: Math Puzzles): Dudeney, Henry E., Gardner, Martin: 0800759796861: : Books