How do you solve conditional probability examples?

How do you solve conditional probability examples?
What is the probability of an event A given that event B has occurred?
This is conditional probability, solved by the formula that P(A|B) which reads "probability of A given B" is equal to the P(A intersect B)/P(B).
Three examples are examined.


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Conditional Probability Formula: P(A|B) = P(A and B)/P(B)