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If A,B,C are three events , Show that p...

If A,B,C are three events , Show that ` p( A cup B cup C)= P(A)+P(B) + P( C) -P (A cap B) - P (B cap C) -P ( C cap A)+ P(A cap B cap C ) `

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The correct Answer is:
`-P(BcapC)-P(CcapA)+P(AcapBcapC).`
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