4. A bin of 52 manufactured parts contains 13 defective parts.Pick 8 parts from the bin at random (a) without replacement and (b)with replacement. In each case compute the probability that you getno defective parts.
5. A postcode consists of 5 digits of numbers from 1 to 9.Suppose a postcode is valid if it consists of at least two repeateddigits (not real), e.g., 95616 and 96616 are valid but 95617 isnot. Suppose one write a random postcode on a letter. What is theprobability that this postcode is valid
