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Dafna11 [192]
3 years ago
6

Thief steals an atm card and must randomly guess the correct threethree?-digit pin code from a 99?-key keypad. repetition of dig

its is allowed. what is the probability of a correct guess on the first? try?
Mathematics
1 answer:
Zielflug [23.3K]3 years ago
3 0
We are given a key pad assuming that the numbers are of 10 options from 0 to 9. IN thsi case, guessing the 3 digit pin number can be determined via counting method. The first number has 10 options so as second and third. Hence the total number of options is 10^3 or 1000. The probability of getting the pin teh first time is 1/1000 or 0.001. 
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