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how the probability of P(E1 ∪ E2) = P(E1) + P(E2)−P(E1 ∩ E2). we know that...

how the probability of P(E1 ∪ E2) = P(E1) + P(E2)−P(E1 ∩ E2).

we know that E1 union E2 = P(E1)+P(E2) (or) but why we do have −P(E1 ∩ E2). at the end of the equation above

thank you in advanced

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