Assume that you have two computers and two sensors in a subway train. If any of the two computers fails and, at the same time, any of both sensors fails, then the subway train is uncontrolled. If the probability of a computer failing is p and the probability of a sensor failing is q at any given time

interval, what is the probability of the subway train becoming uncontrolled in any given time interval? Assume that failures are independent.

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The probability is: p^2[1-(1-p)^2]. If... View the full answer