An instrument consists of two units. Each unit must function for the instrument to…
Mathematics · JEE Advanced · NTA Exams — Statistics and Probability
An instrument consists of two units. Each unit must function for the instrument to operate. The reliability of the first unit is 0.9 & 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 :
- 1/7
- 2/7
- 3/7
- 4/7
Answer
(B) 2/7
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