# Question

The general addition rule for two events is presented in Formula 5.3 on page 204 and that for three events is displayed on page 206.

The General Addition Rule

If A and B are any two events, then

P(A or B) = P(A) + P(B) − P(A & B).

a. Verify the general addition rule for three events.

b. Write the general addition rule for four events and explain your reasoning.

The General Addition Rule

If A and B are any two events, then

P(A or B) = P(A) + P(B) − P(A & B).

a. Verify the general addition rule for three events.

b. Write the general addition rule for four events and explain your reasoning.

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