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2008 UNCO Math Contest II Problems/Problem 9: Revision history

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  • curprev 21:5921:59, 19 October 2014 Timneh talk contribs 436 bytes +436 Created page with "== Problem == Let <math>C_n = 1+10 +10^2 + \cdots + 10^{n-1}.</math> (a) Prove that <math> 9C_n = 10^n -1.</math> (b) Prove that <math>(3C_3+ 2)^2 =112225.</math> (c) Prove t..."
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