Nhận biết (M1)

In a particular airport, radar stations operate independently of each other. The probability that a single radar station will detect an arriving airplane is .

(a) If six radar stations are in use (), calculate the probability that an arriving airplane will be detected by at most two radar stations.

(b) What is the smallest number of radar stations that must be installed if the probability that an arriving airplane will be detected by at least one radar station is not less than .

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