Question 1181087
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    P(A U B) = P(A) + P(B) - P(A ∩ B) = {{{7/20 + 3/5 -21/100}}} = {{{35/100 + 60/100 - 21/100}}} = {{{(35 + 60 - 21)/100}}} = {{{74/100}}} = {{{37/50}}} = 0.74.   <U>ANSWER</U>
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Solved, answered and carefully explained.