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what is 999999999999999999 times 9999?

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    999999999999999999 =

    10^18 - 1

    9999 = 10^4 - 1

    999999999999999999 * 9999 =

    (10^18 - 1)* (10^4 - 1) =

    10^22 - 10^18 - 10^4 + 1

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