Prove P(A’) = 1 - P(A)
The sample space S contains an Event A and everything not A, called A'
We know P(S) = 1
P(S) = P(A U A')
P(A U A') = 1
P(A) + P(A') = 1
subtract P(A) from each side:
P(A’) = 1 - P(A)
The sample space S contains an Event A and everything not A, called A'
We know P(S) = 1
P(S) = P(A U A')
P(A U A') = 1
P(A) + P(A') = 1
subtract P(A) from each side:
P(A’) = 1 - P(A)