An oil refinery has a fire alarm system installed on its premises. The alarm is supposed to go off in case of a fire. The probability of a fire occurring on any given day is 0.25%. Unfortunately, the system that is installed is not perfect. When a fire actually occurs, the alarm goes off 99% of the time. Further, the probability of the alarm going off when there is no fire is believed to be 1%. What is the probability of the alarm rightly not going off on a particular day? a. 99% b. 1% c. 0.1%

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