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addition rule for probabilities.

P(A or B) = P(A) + P(B) - P(AB)

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addition rule for probabilities.

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addition rule for probabilities.

P(A or B) = P(A) + P(B) - P(AB)
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Subject 3. Addition Rule for Probabilities: the Probability that at Least One of Two Events Will Occur
use of the word "or," the key to this rule. The "or" is what we call an "inclusive or." In other words, either one event can occur or both events can occur. Such probabilities are calculated using the <span>addition rule for probabilities. P(A or B) = P(A) + P(B) - P(AB) The logic behind this formula is that when P(A) and P(B) are added, the occasions on which A and B both occur are counted twice. To adjust for this, P(AB) is subtracted. &#

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