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The probability that at least one of the...

The probability that at least one of the events `Aa n dB` occurs is 0.6. If `Aa n dB` occur simultaneously with probability 0.2, then find `P( A )+P( B )dot`

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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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