Fifty-two percent of adults in Delhi are unaware about the reservation system in India. You randomly select six adults in Delhi. Find the probability that the number of adults in Delhi who are unaware about the reservation system in India is

(a) exactly five,

(b) less than four, and

(c) at least four.

Find the indicated probabilities using the geometric distribution, the Poisson distribution, or the binomial distribution. Then determine whether the events are unusual. If convenient, use a table or technology to find the probabilities.