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[" An instrument consists of two units.E...

[" 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 "2" fails.The probability "],[" that "only the first unit failed "&" the second unit is sound is: "],[[" (A) "(1)/(7)," (B) "(2)/(7)," (C) "(3)/(7)," (D) "(4)/(7)]]

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