Credit card numbers typically have 16 digits, but not all of them are random. Answer the following and express probabilities as fractions. a. What is the probability of randomly generating 16 digits and getting your MasterCard number? b. In the past, many teachers posted grades along with the last four digits of the student's social security numbers. If someone already knows the last four digits of your social security number, what is the probability that if they randomly generated the other dig

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