Finite Math Examples

$P (a) = 0.35$ , $P (b) = 0.35$

Step 1

When $a$ and $b$ are mutually exclusive events, the probability of $a$ or $b$ occurring is $P (a \cup b) = P (b \cup a) = P (a) + P (b)$ , which is called the addition rule for mutually exclusive events $a$ and $b$ .

$P (a \cup b) = P (b \cup a) = P (a) + P (b)$

Step 2

Fill in the known values.

$P (a \cup b) = P (b \cup a) = 0.35 + 0.35$

Step 3

Add $0.35$ and $0.35$ .

$P (a \cup b) = P (b \cup a) = 0.7$