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Which of the following is always true? If A and B are independent, then they are...

Which of the following is always true?

If A and B are independent, then they are also mutually exclusive.

If A and B are mutually exclusive, then they are also independent.

If Pr(A|B) = Pr(B|A), then A and B are independent.

If A and B are mutually exclusive, then A and B cannot occur at the same time.

If A and B are independent, then A and B cannot occur at the same time.
Math   Statistics-And-Probability   
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