1.let n be the decimal form of a rational number a/b, where a and b are nonzero integers.
a. if n is a terminating decimal, what can be said about the factors of b? explain.
b. if n is a repeating decimal, what can be said about the number of digits in the repeating block? explain.

In a test for esp (extrasensory perception), a subject is told that cards only the experimenter can see contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has probability 0.25 of guessing correctly on each card. a. the count of correct guesses in 20 cards has a binomial distribution. what are n and p? b. what is the mean number of correct guesses in 20 cards for subjects who are just guessing? c. what is the probability of exactly 5 correct guesses in 20 cards if a subject is just guessing?