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A safe has a code consisting of four numbers selected from 0 to 99 with repetition.

The counting principle suggests that the number of possibilities for an event to occur iscounted at each step and then multiplied to get the total number of possibilities for that event to happen.

Let A be the event of getting the correct combination of numbers.

The number of digits from 0 to 99 is equal to 100.

The total number of ways in which four numbers can be selected from 0 to 99 with repetition is shown below:

$$\begin{gathered} \text{Total}\text{number}\text{of}\text{ways}=\text{100}脳\text{100}脳\text{100}脳\text{100} \\ =100000000 \end{gathered}$$

The number of ways of arranging the four numbers to get the correct combination is equal to 1.

The probability of guessing the correct combination of numbers is shown below:

$P\left(A\right)=\frac{1}{100000000}$

Therefore, the probability of guessing the correct combination of numbers is equal to $\frac{1}{100000000}$.

Since theprobability value is extremely low(approximately equal to 0), it can be said it is not feasible to guess the correct combination of numbers on the first try.