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21 June, 13:19

A thief steals an ATM card and must randomly guess the correct three -digit pin code from a 10 -key keypad. Repetition of digits is allowed. What is the probability of a correct guess on the first try?

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  1. 21 June, 14:47
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    Since repetition is allowed, there are 10 (10) (10) choices available; 10 for the first digit, 10 for the second digit, and 10 for the third digit, coming out to a possible 1000 combinations. The probability of getting the 1 correct on the first try would be 1/1000.
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