ProbabilityHard
Question
An instrument consists of two units. Each unit must function for the instrument to operate. The reliability of the first unit is 0.9 and that of the second unit is 0.8. The instrument is tested & fails. The probability that ″only the first unit failed & the second unit is sound″ is
Options
A.1/7
B.2/7
C.3/7
D.4/7
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