P(A)=7/20,P(B)=3/5,P(A∩B)=21/100 ,P(A∪B)=? A. 7/50 B. 91/400 C. 301/400 D. 37/50 Anything??

asked Dec 22, 2018 118k views

5 votes

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

A.
7/50
B.
91/400
C.
301/400
D.
37/50

Anything??

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4 votes

$P(A U B) = P(A) +P(B) - P(AB) \\ \\ = (7)/(20) +(3)/(5) - (21)/(100) \\ \\ = (35)/(100) +(60)/(100) - (21)/(100) \\ \\ =(74)/(100) \\ \\ =(37)/(50)$

Phonixor answered Dec 28, 2018

8.8k points

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