Ononot — If P(A) = 0.3, P(B) = 0.4, and P(A|B) + P(B|A) = 0.9, find P

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If $P(A) = 0.3$ , $P(B) = 0.4$ , and $P(A|B) + P(B|A) = 0.9$ , find $P(A \cap B)$ .