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February 28, 2015

February 28, 2015

Posted by **JD** on Sunday, August 26, 2007 at 5:34pm.

- math -
**Ms. Sue**, Sunday, August 26, 2007 at 5:40pmWhat do you think the answer is? We'll be glad to check your answer if you post it here.

- math -
**Count Iblis**, Sunday, August 26, 2007 at 5:44pm999999999999999999 =

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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