wingleo9930 wingleo9930

23-05-2018
Mathematics

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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 tramserran

23-05-2018

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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