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A thief steals an atm card and must randomly guess the correct three​-digit pin code from a 7​-key keypad. repetition of digits is allowed. what is the probability of a correct guess on the first

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tramserran
First digit: 1 digit out of 7 total keys = 1/7
Second digit: 1 digit out of 7 total keys = 1/7
Third digit: 1 digit out of 7 total keys = 1/7

First AND Second AND Third
 1/7    x       1/7        x      1/7   = 1/343

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