选择题
2016 AMC 8 Problem 17: ATM Passwords
An ATM password at Fred's Bank is composed of four digits from 0 to 9, with repeated digits allowable. If no password may begin with the sequence 9, 1, 1, then how many passwords are possible?
2016 AMC 8 第 17 题：ATM 密码
Fred银行的ATM密码由0到9的四位数字组成，允许重复数字。如果没有密码可以以序列 9、1、1 开头，那么可能有多少个密码
A.
30
B.
7290
C.
9000
D.
9990
E.
9999