If P(A) = 0.6, P(B) = 0.45, and P(A and B) = 0.25. Find a) At least

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If P(A) = 0.6, P(B) = 0.45, and P(A and B) = 0.25. Find
a) At least one of the two events occurs.
b) A occurs B occurs but not both simultaneously.

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