1
Q
Probability
A
measures the likelihood that an even will occur
2
Q
Formula for Probability (if all the possible outcomes are equally likely to occur)
A
Probability = (# of Desired Outcomes)/(# of Possible Outcomes)
3
Q
Probability of Multiple Independent Events
A
Multiply the probabilities of the individual events
4
Q
Probability of Multiple Dependent Events
A
Multiply the probabilities of the individual events, BUT you have to calculate the probability of each dependent event as if the preceding event had resulted in the desired outcome
5
Q
“Probability of A or B or both” Formula
A
P(A or B) = P(A) + (P)B - P(A and B)
GRE Prep- Counting Methods and Probability
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