A formula we gave for conditional probability is P(E2 E1)
Chapter 12, Problem 12.1.458(choose chapter or problem)
A formula we gave for conditional probability is P(E2 E1) = n (E1 and E2) n (E1) This formula may be derived from the formula P(E2 E1) = P(E1 and E2) P(E1) Can you explain why? [Hint: Consider what happens to the denominators of P(E1 and E2) and P(E1,) when they are expressed as fractions and the fractions are divided out.]
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