Question
Asked Oct 30, 2019

How can I tell whether to use the addition rule or the multiplcation rule when determining probability?

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Expert Answer

Step 1
Step 2
1.Addition rule:
The addition rule of probability says that, the probability that A or B will
occur is the sum of the probabilities that A will happen and that B will
happen, subtract the probability that both A and B will happen
Formula:
P(AB) P(A)+P(B)-P(AnB)
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1.Addition rule: The addition rule of probability says that, the probability that A or B will occur is the sum of the probabilities that A will happen and that B will happen, subtract the probability that both A and B will happen Formula: P(AB) P(A)+P(B)-P(AnB)

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Step 3
Considering one example for better understanding:
When drawing one card out of a deck of 52 playing cards, what is the
probability of getting heart or a king?
Solution:
H: Heart
K:King
13
P(H)
52
12
P(K)
52
And
P(HOK)
52
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Considering one example for better understanding: When drawing one card out of a deck of 52 playing cards, what is the probability of getting heart or a king? Solution: H: Heart K:King 13 P(H) 52 12 P(K) 52 And P(HOK) 52

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