A formula we gave for conditional probability is P(E 2 |E 1 ) = n(E 1 and

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A formula we gave for conditional probability is 

P(E2|E1) = n(Eand E2)/n(E1)

This formula may be derived from the formula

P(E2|E1) = P(Eand E2)/P(E1)

Can you explain why? [Consider what happens to the denominators of P(Eand E2) and P(E1), when they are expressed as fractions and the fractions are divided out.]

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Related Book For  answer-question

A Survey of Mathematics with Applications

ISBN: 978-0134112107

10th edition

Authors: Allen R. Angel, Christine D. Abbott, Dennis Runde

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