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If E1, E2, E3 are mutually exclusive and...

If `E_1, E_2, E_3` are mutually exclusive and exhausive events then what is the value of `P(E_1)+P(E_2)+P(E_3)`?

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PRADEEP PUBLICATION-PROBABILITY-EXERCISE
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  13. If E1 and E2 mutually exclusive, then find P(E1//E2).

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