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## What is the probability that either A or B occurs?

Inclusion-Exclusion Rule: The probability of either A or B (or both) occurring is P(A U B) = P(A) + P(B) – P(AB). Conditional Probability: The probability that A occurs given that B has occurred = P(A|B). In other words, among those cases where B has occurred, P(A|B) is the proportion of cases in which event A occurs.

**How do you find the probability of neither A or B?**

P[not A or not B] = P(not A) + P(not B) – P(not A and not B) = 0.5 + 0.6 – 0.4 = 0.7 .

**How do you find the probability of either?**

The equation for determining the either/or probability of overlapping events is: P(A or B) = P(A) + P(B) – P(A and B). As you can see, you must subtract out the probability of the overlapping event to get the right answer.

### What is the probability that neither event occurs?

The probability of an event not occurring, written 𝑃 of 𝐴 prime, is equal to one minus the probability of 𝐴 occurring. As the probability of 𝐴 is equal to five-sixths, the probability of 𝐴 not occurring is one minus five-sixths.

**What is the meaning of neither A nor B?**

Neither means literally “not either”, and nor is the corresponding coordinating conjunction, similar in syntactic function to and and or. “Neither a nor b” means a is false and b is false [in formal logic, this explanation is called DeMorgan’s Law].

**How do you find the probability of both events occurring?**

Just multiply the probability of the first event by the second. For example, if the probability of event A is 2/9 and the probability of event B is 3/9 then the probability of both events happening at the same time is (2/9)*(3/9) = 6/81 = 2/27.

#### What is neither nor in probability?

If the probability of an event A = 0.2 & the probability of the event B is 0.3, then the probability of neither A nor B occurs depends upon the fact that A & B are mutually exclusive or not.

**What is the probability of neither a or B occurring?**

The probability of A or B occurring is always P (A) + P (B) – P (A and B). Since these two events are mutually exclusive, the P (A and B) = 0. So P (A or B) = P (A) + P (B) = 0.3 + 0.2 = 0.5 The probability of neither is 1 – P (A or B) so it is 1 – 0.5 =0.5. P (A or B) = 0.5

**Are events A and B mutually exclusive?**

SOLUTION: Events A and B are mutually exclusive. Suppose P (A)=0.21 and P (B)=0.05. What is the probability that neither A nor B will occur?

## How do you find the probability of A and B?

Answer Wiki. 6 Answers. The probability of A or B occurring is always P(A) + P(B) – P(A and B). Since these two events are mutually exclusive, the P(A and B) = 0. So P(A or B) = P(A) + P(B) = 0.3 + 0.2 = 0.5 The probability of neither is 1 – P(A or B) so it is 1 – 0.5 =0.5. P(A or B) = 0.5.

**Is the formula for neither a nor B occurring?**

Yes, it is awkward wording, but does seem to intend to say “neither A nor B occurring.” Which is ( A ∪ B) ∁, making you calculations correct. Thanks for contributing an answer to Mathematics Stack Exchange!