Suppose that a link between two telephone offices has 50 (Fifty) repeaters.
Suppose that the probability that a repeater fails during a year is 0.01, and
that repeaters fail independently of each other.
Suppose to reduce overall link cost we took a decision to reduce the number
of repeaters from 50 (Fifty) to 10 (Ten), calculate the probability that single
repeater does not fail during one year will be :
(A) 0.110 (B) 0.120
(C) 0.990 (D) 0.001