a website requires each user to create a 4 digit identification number. each digit can be any whole number 0 through 9. what is the probability of guessing a us

Question

a website requires each user to create a 4 digit identification number. each digit can be any whole number 0 through 9. what is the probability of guessing a user identification number in one try? 

A. 1/10,000

B. 1/1000

c. 1/999

D. 1/9999

 

Answer 1

Hi,

The total number of 4 digit user id that can be generated using digits 0-9 can be calculated:

 

10⋅10⋅10⋅10 = 10,000

 

P(u) = 1/ 10,000, Probability of each user id. The answer choice is A.

 

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