Answers
here parallel block of 3 elements works =1-P(none of 3 works)=1-(1-0.9)*(1-0.95)*(1-0.95)=0.99975
probability that lower parallel branch works =0.99975*0.99=0.989753
probability that upper parallel branch works =0.9*0.9*0.9=0.729
hence P(circuit operates)=1-P(none of parallel branch works)
=1-(1-0.989753)*(1-0.729)=0.997223
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