Question

19. A social security number contains nine digits, such as 487-67-3091. How many different social security numbers can be formed?

Answer 1

There are 1 billion possible different social security numbers that could be formed.

`1,000,000,000`

Step-by-step explanation:

Given that a social security number contains nine digits.

Each of the digits can be any of the numbers 0-9.

`10\text{ possible number per digit}`

The total number of possible 9 digit numbers that could be generated would be;

`\begin{gathered} n=10^9 \\ n=1,000,000,000 \\ n=1\text{ billion} \end{gathered}`

Therefore, there are 1 billion possible different social security numbers that could be formed.

`1\text{ billion}`