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[" In a class of "60" boys and "20" girl...

[" In a class of "60" boys and "20" girls,half of the boys and half of the girls know cricket.Find the "],[" probability of the event that a person selected from the class is either a boy,or "f" and knowing "],[" cricket."],[" For any two events "A" and "B" ,show that "P(A^(c)nn B^(c))=1+P(A nn B)-P(A)=P(B)]

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