![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
P(B) = 0.3 , P( AUB ) = 0.65 and P( A∩B ) = 0.15.
\Apply formula: P( AUB ) = P(A) + P(B) − P( A∩B )
\Substitute : P(B) = 0.3 , P( AUB ) = 0.65 and P( A∩B ) = 0.15.
\0.65 = P(A) + 0.3 − 0.15.
\0.65 = P(A) + 0.15.
\P(A) = 0.65 − 0.15.
\P(A) = 0.5.
\![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
P(A) = 0.5.