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Where $$A,B,C,D,E$$ are distinct digits satisfying this addition fact, then $$E$$ is
The addition is $$ABC+CBA=DEDD$$. Checking the column carries gives $$D=1$$ and $$E=2$$, while the distinct digit condition is satisfied by choices such as $$A=3,B=5,C=8$$. Therefore $$E=2$$.
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