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 A piece of electronic equipment used for aviation has three elements connected in series, or sequence

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 A piece of electronic equipment used for aviation has three elements connected in series, or sequence. The reliability of each of the three elements is as follows:

Element A: 0.92 Element B: 0.94 Element C: 0.91

a) Draw how these three elements are connected.

b) What is the reliability of this system?

c) If each of the elements is provided with a standby (connected in parallel) element of equal reliability, by how much is the overall reliability improved?