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The five-digit number $411A2$ is a multiple of $9$. What digit does A represent? 
Overseas Competition->Knowledge Point->Word Problem Modules->Applying of Multiplication and Division
From the Divisibility Rule of $9$, the sum of the digit of 411A2 must be divisible by $9$.  $4 + 1 + 1+ 4 + 2 = 8 + A$  Hence A = $1$. 