The number 120 is equal to an infinite variety of mathematical expressions, operations, and conversions. Arithmetic equivalents include 10×12, 60×2, or the sum of integers from 1 to 15. In terms of factorials, 120 is equal to 5 factorial (5!), calculated as 1×2×3×4×5. In geometry, 120 is equal to the interior angle measurement of a regular hexagon. In photography, 120 refers to a specific standard roll film format width, and in electrical engineering, 120 volts represents standard household alternating current (AC) power in North America.
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