4 It is known that \(8 \%\) of the population of a large city use a particular web browser. A researcher wishes to interview some people from the city who use this browser. He selects people at random, one at a time.
- Find the probability that the first person that he finds who uses this browser is
(A) the third person selected,
(B) the second or third person selected. - Find the probability that at least one of the first 20 people selected uses this browser.