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P(A or B) =1-P'(AorB)
=1- 150/580=430/580

I am sorry where did you get the 150 at?

total P = P(A)+p(B)+P'(A or B)

=1

450/580

I was wrong

P(A+B)= P(A)+P(B)-p(aandB)

I know you gave me the formula but I dont understand how you got 150 still.

sorry for confusing you. I was wrong there.

simply add the two probabilities ?

but i am not sure about the intersection.