P(A | B) = P(A B) / P(B)
So,
P(A B) = 0.3 * 0.5 = 0.15
Hence,
P(A U B) = P(A) + P(B) - P(A B) = 0.4 + 0.5 - 0.15 = 0.75
Option A is correct.
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