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The probability that atleast one of A an...

The probability that atleast one of A and B occur is 0.6. If A and B occur simultaneously with probability 0.2, then find `P(overline(A))+P(overline(B))`.

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It is given that `P(A uu B) = 0.6` and `P(A nn B) = 0.2`.
`P(A uu B) = P(A) + P(B) - P(A nn B)`
or `0.6 = P(A) + P(B) - 0.2`
` or P(A) + P(B) = 0.8`
or `1 - P(bar(A)) + 1- P(bar(B))= 0.8`
or `P(barA)+P(bar(B)) = 1.2`
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