Chapter 13.8, Problem 14PPS

To determine

To calculate: Probability that the last two numbers are your age.

Answer to Problem 14PPS

Probability that the last two numbers are your age is $\frac{1}{100}$ .

Explanation of Solution

Given information:

Every U.S citizen has a nine digit social security number.

Each of the last two numbers is picked randomly, so there are $10$ possibilities for each number.

  $\begin{array}{l}10\times 10\\ =100\end{array}$

There is only one possibility for your age.

Thus, the probability is $\frac{1}{100}$ .