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# Puzzles

## Archive

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## XYZ

Which digits $$X$$, $$Y$$ and $$Z$$ fill this sum?
$$\begin{array}{cccc} &X&Z&Y\\ +&X&Y&Z\\ \hline &Y&Z&X \end{array}$$
If you enjoyed this puzzle, check out Sunday Afternoon Maths LXII,
puzzles about differentiation, or a random puzzle.