10. suppose that P(A)=p1 ,P(B)= p2 , P(C)=p3 .write down the probability that at least one of the three events A,B or C will occur .

i.P(A^cUB^c)=ii.P(A^c∩B)=

iii.P(A^cUB)=

iv.P(A^c∩B^c)=

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11.give that : P(A)=P(B)=P(C)=1/4,P(A∩B)=P(C∩B)=0 and P(A∩C)=1/8 ,compute the probability that at least one of the three events A,B or C will occur .