ITPEC IP October 2018 Question 15
ITPEC IP October 2018 — Question 15 of 100
The parallel combination of B and C has the highest availability, 0.9975. It fails only when both devices fail, so its availability is 1-(1-0.95)*(1-0.95)=0.9975. The other arrangements contain series components, which reduce overall availability.
Answer (d)
Why not others:
- A and B in series give 0.90*0.95=0.855
- A, B, and C in series give 0.81225
- A in series with parallel B and C gives 0.90*0.9975=0.89775
Key rule: Multiply availabilities in series; for independent parallel components, calculate one minus the probability that all components fail.
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