A Social Security number has seven digits. How many Social Security numbers are possible?
since there are 10 choices for each digit, that would mean there are 10^7 possible numbers.
Actually, SS numbers have 9 digits.
9 digits, 10 choices for each digit (0-9)
9^10
To determine the number of possible Social Security numbers, we need to consider the total number of options for each digit.
Since a Social Security number has seven digits, we have to calculate the possibilities for each digit.
For the first digit, it can have any digit from 1 to 9 (excluding 0). So, there are 9 possibilities for the first digit.
For the second digit, third digit, fourth digit, fifth digit, sixth digit, and seventh digit, each can have any digit from 0 to 9 (since 0 is included). So, there are 10 possibilities for each of these digits.
Now, to find the total number of Social Security numbers, we multiply the number of possibilities for each digit together:
Total number of Social Security numbers = 9 * 10 * 10 * 10 * 10 * 10 * 10 = 9 * (10^6)
Therefore, there are 9 million possible Social Security numbers.