Social security number contains nine digits 0 0 0 0 0 0 0 0 0 how many different Social Security numbers can be formed using in a in a numerals from 0-9

First spot: 9 choices (0-9)

Second spot: 9 choices (0-9)

Third spot: 9 choices (0-9)

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Ninth spot: 9 choices (0-9)

There are 9 choices for each digit, meaning we need to compute 9^9 to figure out how many possible social security numbers there are.

9^9 = 387420489 possible social security numbers

9 digits x 9 numbers = 81