A Social Security number has nine digits. How many Social Security numbers are possible?
A) 1,000,000,000
B) 362,880
C) 40,320
D) 999,999,999
E) 800,000,000

Question

A Social Security number has nine digits. How many Social Security numbers are possible? ​
A) 1,000,000,000
B) 362,880
C) 40,320
D) 999,999,999
E) 800,000,000

Quizplus · Accepted Answer

Each of the nine digits in a Social Security number can be any digit from 0 to 9, making 10 possibilities for each digit. Since there are nine digits, the total number of possible Social Security numbers is 10^9 = 1,000,000,000.

A Social Security Number Has Nine Digits