Question

Maria has a debit card with a 4 digit PIN number. Each number can be between 0 and 9. What is the probability that you can figure out her pin number?

Answer 1

The total possible 4 digit pins from the each number between 0 and 9 is,

`\begin{gathered} n(T)=10\cdot10\cdot10\cdot10 \\ =10000 \end{gathered}`

The debit card has only one correct pin. So possibe outcome is,

`n(P)=1`

Determinen the probability for the figure out correct pin is,

`\begin{gathered} P=(n(P))/(n(T)) \\ =(1)/(10000) \\ =0.0001 \end{gathered}`

Thus answer is 0.0001 or 1/10000.