# Twenty

Twenty swallows sit on a 10 m long telephone cable. Assume that swallows are completely randomly distributed along the line.

(a) What is the probability that more than three swallows sit on a randomly selected section of cable 1 m long?

(b) What is the probability that the spacing between two swallows will be greater than 1 m and at the same time less than 2 m?

(a) What is the probability that more than three swallows sit on a randomly selected section of cable 1 m long?

(b) What is the probability that the spacing between two swallows will be greater than 1 m and at the same time less than 2 m?

### Correct answer:

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