# Download PROBABILITY Probability of An Event: P(A) = The number of ways

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```PROBABILITY
Probability of An Event: P(A) = The number of ways event (A) can occur
The total number of possible outcomes
Example: A single 6-sided die (1, 2, 3, 4, 5, 6) is rolled. What is the
probability of each outcome?
P(2 or 3) = number of ways to roll a 2 or 3
2
=
total number of sides
6
P(even #) = number of ways to roll an even number = 3
6
total number of sides
Independent Compound Events
Two events, A & B, are independent if the fact that A occurs does not affect the
probability of B occurring.
To find the probability of two independent events that occur in sequence, find
the probability of each event occurring separately, and then multiply the
probabilities. P(A and B) = P(A) * P(B).
Example: A coin is tossed and a single 6-sided die is rolled. Find the
probability of landing on the head side of the coin and rolling a 3 on
the die.
P(Head) =
and P(3) =
=
```