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## Homework Statement

P(A) = 0.3

P(B) = 0.5

P (A and B) = 0.2

Find P (Not A, given not A or/and not B)?

## The Attempt at a Solution

So I think

P (Not A, given not A or/and not B)=

P (Not A and (Not A or/and Not B)) / P (Not A or/and Not B)

Is this correct? But I don't understand how to calculate P (Not A and (Not A or/and Not B)). Could someone help with this part?