A typical Social Security number is 555-47-5593. How many Social Security numbers are possible if the first two digits cannot be 0?
1
0
To determine the number of possible Social Security numbers, we need to consider each digit separately.
First, let's consider the first digit. Since it cannot be 0, there are 9 possible choices (1-9).
Next, let's consider the second digit. Like the first digit, it also cannot be 0. So, again, there are 9 possible choices (0 is excluded, but 1-9 are available).
Moving on to the third digit (which is after the hyphen) - there are 10 possible choices (0-9). This is because the third digit can be any number from 0 to 9.
For the fourth and fifth digits (which are after the second hyphen) - each digit has 10 possible choices as well, ranging from 0 to 9.
Therefore, the total number of possible Social Security numbers can be calculated by multiplying the number of choices for each digit: 9 × 9 × 10 × 10 × 10 = 81,000 possible Social Security numbers.
So, there are 81,000 possible Social Security numbers if the first two digits cannot be 0.