In the following column puzzle, different letters represent different one-digit numbers. Find the three-digit number represented by $$ABC$$.  $$\begin{matrix}\& \& 8 \& 8\& \boxed C \textbackslash\textbackslash{} \&\&5\& \boxed B \&4 \textbackslash\textbackslash{} + \&\&\boxed A\&1 \&7 \textbackslash\textbackslash{} \hline \&2~\&0 \&2 \&1\textbackslash\textbackslash{} \end{matrix}$$ 
Overseas Competition->Knowledge Point->Combinatorics->Number Puzzles
Start from the ones digit, $$4+7=11$$, $$0+1=1$$, so $$C=0$$.  In the tens place, $$8+1+1=10$$, $$0+2=2$$, so $$B=2$$.  In the hundreds place, $$8+5+1=14$$, $$14+6=20$$, so $$A=6$$. 