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2021 ZeMC10 Problems/Problem 1

Problem

Find $\tfrac{21}{20} - \tfrac{20}{21}$.

$\textbf{(A) } - \tfrac{841}{420} \qquad \textbf{(B) } - \tfrac{41}{420} \qquad\textbf{(C) } \tfrac{41}{420} \qquad\textbf{(D) } \tfrac{841}{420} \qquad\textbf{(E) } 2$

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