If probability of a certain events a is p(a)=0.5then p(A)=
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p(a)+p(A)=1
therefore p(A)=1-p(a)
p(A)=1-0.5
hence p(A)=0.5
therefore p(A)=1-p(a)
p(A)=1-0.5
hence p(A)=0.5
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