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Please help The PIN for ATM machine has 4 digits. Suppose that PIN numbers are assigned at random, so that all digit numbers are equally

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The PIN for ATM machine has 4 digits. Suppose that PIN numbers are assigned at random, so that all digit numbers are equally likely. a) How many possible PINs are there? b) What is the probability that PIN assigned at random has at least one 0 and at least one 1

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