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(i) If P is a probability function, show...

(i) If P is a probability function, show that for any two events A, B.
`P(AnnB) le P(A) le P(AuuB) le P(A)+P(B)`
(ii) For any two events A,B show that
`P(barAnnbarB)=1+P(AnnB)-P(A)-P(B)`

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