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The probability that A speaks truth is $\frac{4}{5}$, while this probability for B is $\frac{3}{4}$. The probability that they contradict each other when asked to speak on a fact is


( A ) $\frac{3}{20}$
( B ) $\frac{4}{5}$
( C ) $\frac{1}{5}$
( D ) $\frac{7}{20}$

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