Question 834689
P(at least 1 defect)=1-P(no defect)
P(no defect)={{{96/100=24/25}}}
P(no defect, 4 bulbs)={{{(24/25)(24/25)(24/25)(24/25)=331776/390625}}}
P(at least 1 defect)={{{1-331776/390625=390625/390625-331776/390625=58849/390625}}}