In the USA, a zip-code is a 5-digit sequence containing the numbers 0-9. (a) (1 point) How many total zip-codes can we make? (We will include 00000 as a zip code). (b) (2 points) What is the probability that a randomly selected zip code has exactly two 1’s? (c) (2 points) What is the probability that the zip code has at least one 7?
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