4. Compound Probability
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If events A and B are mutually exclusive, then the probability that either A or B occurs is the sum of the probability of A occurring and the probability of B occurring.
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In order to find the desired probability, we will find the probability that we select a green chip and the probability that we select a red chip one at a time. Let's start by calculating the probability of choosing a green chip.
Out of 15 chips in the bag, there are 2 green chips. P( green chip)= 2/15 Next, we will calculate the probability of choosing a red chip.
P(A or B)= P(A) + P(B)
P(green chip)= 2/15, P(red chip)= 4/15
Add fractions
a/b=.a /3./.b /3.