Use the formula of Theorem 2.7 to show that In Theorem 2.7 P(A B) = P(A)

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Use the formula of Theorem 2.7 to show that
In Theorem 2.7
P(A ∪ B) = P(A) + P(B) – P(An B)
(a) P(A ∩ B) ≤ P(A) + P(B);
(b) P(A ∩ B) ≥ P(A) + P(B) - 1.
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