The probability that you will clear an entrance exam in any attempt is 0.26. Find the probability that you

(a) clear the exam on the fourth attempt,

(b) clear the exam on the first, second or third attempt,

(c) do not clear the exam on the first three attempts.

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.