The probability that at least one of the event A and B occur is 0.6. If A and B occur simultaneously with probability 0.2, then P(A) ̅ + ((B)) ̅ is

Hint. Given P(A)P(B_bar) + P(A_bar)P(B) + P(A)P(B) = 0.6. Also given that P(A)P(B) = 0. From here we can find that P(A_bar)P(B_bar) = 1 – 0.6 = 0.4. Now solve first equation to get the value of desired term. Thanks.