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?A. 30B. 7290C. 9000D. 9990E. 9999
A. 30
B. 7290
C. 9000
D. 9990
E. 9999
It won't just hand you the answer — it asks where you're stuck.How the checker works
Worked solution
Answer
D. 9990
AI analysis — may contain mistakes.
Worked this one out on paper? Snap your steps and Gigle's AI math checker will circle the step where it went wrong.
More questions on this topic
- 1Consider all positive four-digit integers consisting of only even digits. What fraction of these integers are not divisi…
- 2How many integers between 1000 and 9999 have four distinct digits? A. 3024 B. 4536 C. 5040 D. 6480 E. 6561
- 3An integer between 1000 and 9999, inclusive, is chosen at random. What is the probability that it is an odd integer whos…
- 4从这个数字中任取个不同的数,使它们的和为奇数,有多少种不同的选法?
- 5In the small country of Mathland, all automobile license plates have four symbols. The first must be a vowel (, ,…