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2003 AMC 12B Problems/Problem 8

Revision as of 22:24, 19 December 2012 by Mathematician153 (talk | contribs)

Let $a$ and $b$ be the digits of $x$,

\[\clubsuit(\clubsuit(x)) = a + b = 3\]

Clearly the only two digit numbers whose digits sum to $3$ are $12, 21,$ and $30$, thus the answer is $3 \Rightarrow \text (A)$

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