Question

What are the total amount of choices possible if an individual is to create a 4 digit password using the digits 0 through 9 inclusive, but not using the digit 0 as the first character of the password?
a.
39
b.
900
c.
399
d.
9000



Please select the best answer from the choices provided.


A
B
C
D

Answer 1

D

First digit: 1–9 → 9 choices. Each of the other three digits: 0–9 → 10 choices each.
Total = 9 × 10 × 10 × 10 = 9,000.