Question

A 4-digit pin number is to be created using the digits 0 through 9. The first digit must be a 5 or an 8, and the last digit cannot be 0. How many pin numbers can be created?

A.
5,040
B.
6,561
C.
1,458
D.
1,800

Answer 1

First digit:5 or 8 so 2 possible numbers
Second:Any of 0 to 9 so 10 possible numbers
Third:Any of 0 to 9 so 10 possible numbers
Last:Any of 1 to 9 so 9 possible numbers
So Answer is,
2*10*10*9=1800