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PIN NUMBERS : Suppose you have to select a four-digit PIN number and all four digits must be different. a)How many different PIN numbers are

PIN NUMBERS: Suppose you have to select a four-digit PIN number and all four digits must be different.

a)How many different PIN numbers are possible?

b)Suppose someone tries to guess your PIN number. What is the probability that the person will guess your PIN number on the first try? Write your answer as a fraction.

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