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Suppose that ATM PINs consist of 4 to 6 digits, chosen from 0,1,2,3,4,5,6,7,8,9 . (a) How many ATM PINs are possible? (b) How many ATM

Suppose that ATM PINs consist of 4 to 6 digits, chosen from 0,1,2,3,4,5,6,7,8,9 . (a) How many ATM PINs are possible? (b) How many ATM PINs do not contain a repeated digit? (c) How many ATM PINs contain one or more repeated digits

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