Can someone please help me out here. I can't figure out how to do them. I need Pr(A) to do them with the formulas that I know. Please help!

Given that Pr(B) = 1/5, Pr(A|B) = 1/3 and Pr(A|B') = 1/3.

Determine:
a) Pr(A and B')
b) Pr(A)
c) Pr(B'|A)

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