SOLUTION: P(A)=7/20,P(B)=3/5,P(A∩B)=21/100 ,P(A∪B)=?

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Question 1181087: P(A)=7/20,P(B)=3/5,P(A∩B)=21/100 ,P(A∪B)=?
Answer by ikleyn(52775) About Me  (Show Source):
You can put this solution on YOUR website!
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    P(A U B) = P(A) + P(B) - P(A ∩ B) = 7%2F20+%2B+3%2F5+-21%2F100 = 35%2F100+%2B+60%2F100+-+21%2F100 = %2835+%2B+60+-+21%29%2F100 = 74%2F100 = 37%2F50 = 0.74.   ANSWER

Solved, answered and carefully explained.