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Please show steps i need to do more similar problems just the answer wont help

In a complex manufacturing process, three operations are performed in series. Because of the nature of the process, machines frequently fall out of adjustment and must be repaired. To keep the system going, two identical machines are used at each step; thus if one fails, the other can be used while the first is repaired. The machine configuration is shown below. The reliabilities of machines A, B and Care 0.85, 0.85 and 0.92 respectively. Calculate the reliability of the system assuming that only one of each machine exists. O 0.576 0.612 0.626 0.648 0.665 0.677 0.704 O 0.719