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Which of these is equal to $\frac{10}{9} + \frac{9}{10}$?

(A) $1$ (B) $2$ (C) $2.0\dot{1}$ (D) $2.\dot{1}$ (E) $2.\dot{2}$

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Source: UK Mathematics Trust, licensed © UK Mathematics Trust; past papers published free at ukmt.org.uk. Statement reproduced verbatim; metadata (topic, difficulty, ordering) added by this project. Solutions are the publisher's, linked not copied.