Question 328096
a)P(all O+)={{{(0.83)(0.83)(0.83)=0.572}}}
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b)P(none O+)={{{(0.17)(0.17)(0.17)=0.00491}}}
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c)"At least 1 O+" is equivalent to "not none O+" (forgive the incorrect English).
P(not none O+)+P(none O+)={{{1}}}
P(not none O+)={{{1}}}-P(none O+)
P(not none O+)={{{1-0.00491}}}
P(at least 1 O+)={{{0.995}}}