P(a or b ). p(a or b) indicates choose the correct answer below. a. the probability that a and b both occur in the same trial. b. the probability that in a single trial, event a occurs, event b occurs, or they both occur. c. the probability that event a occurs in one trial followed by event b in another trial. d. the probability that event a or event b does not occur in a single trial.

Option B is right

Step-by-step explanation:

P(A or B)

In set theory if A and B are two sets we have either A occurs or B occurs or both as

P(A or B) = P(AUB)

This implies that A occurs or B occurs

Probability is calculated as P(A)+P(B)-P(AB)

P(AB) here represents both occurring and this is subtracted as this was added two times

Option A is wrong because this is AB

Option C is wrong because it is not necessary A occurs first

D is wrong because this is A'UB' where A' represents the complement of A

So correct answer out of four options is

B. the probability that in a single trial, event A occurs, event B occurs, or they both occur.

step-by-step explanation:

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