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The question is to find the probability of P(A2 U A3 | A1)

I found that A2 U A3 is equal to 0.4675 but I'm confused on which equation to use to get the rest of the answer...

I originally thought you would just do P((A2 U A3) [itex]\bigcap[/itex] A1) / P(A1) but I'm not getting the correct answer...any help?