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28 November, 11:14

Evaluate the expression. 9! - 5!

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  1. 28 November, 14:27
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    The! sign in mathematics means factorial.

    This is the product of a number and below it until 1.

    In mathematical language

    a! = a * (a - 1) !

    So,

    5! = 5 * 4 * 3 * 2 * 1 = 120

    9! = 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1 = 326 880

    Therefore 9! - 5! = 326 880 - 120 = 326 760
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