Balance puzzle

A balance puzzle or weighing puzzle is one of a number of logic puzzles based on the balancing of similar-looking items—often coins—to determine which holds a different value within a limited number of uses of the balance scales. These differ from puzzles that assign weights to items, in that only the relative mass of these items is relevant. N weighings are sufficient to find a bad coin among (3^n-1)/2 coins.

Balance puzzle

A balance puzzle or weighing puzzle is one of a number of logic puzzles based on the balancing of similar-looking items—often coins—to determine which holds a different value within a limited number of uses of the balance scales. These differ from puzzles that assign weights to items, in that only the relative mass of these items is relevant. N weighings are sufficient to find a bad coin among (3^n-1)/2 coins.