Question 1152534
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Use the general formula of the probability theory


    P(A U B) = P(A) + P(B) - P(A and B).


In your case it takes the form


    P(English or French) = P(English) + P(French) - P(English and French) = 0.85 + 0.35 - 0.25 = 0.95 = 95%    <U>ANSWER</U>
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