Main Concept

The least common multiple (LCM) of two integers $a$ and $b$ is the smallest positive integer which is a multiple of both $a$ and $b$. Consider two balls bouncing in steps of length $a$ and $b$ respectively, and watch them bounce until they both land on the ground together (after starting together). The total (horizontal) distance they have traveled is the LCM of $a$ and $b$.

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MathApps/DiscreteMathematics