Suppose a company needs temporary passwords for the trial of a new payroll software. Each password will have two letters, followed by one digit, followed by one letter. The letter W will not be used. So, there are 25 letters and 10 digits that will be used. Assume that the letters can be repeated. How many passwords can be created using this format?

A website requires users to set up an account that is password protected. If the password format is four letters followed by a single digit number, how many different passwords are possible?

(b) To log on to a certain computer account, the user must type in a 5-letter password. In such a password, no letter may be repeated, and only the lower case of a letter may be used. How many such 5-letter passwords are possible? (There are 26 letters in the alphabet.)

a password consists of 3 letters from a to f inclusive and 4 digits from 0 to 9 inclusive.each letter and digit can only be usd once.how many different password can be formed?

A password must start with a letter, be at least 6 characters long, include a number, not include any whitespace, and include a special symbol. How many of the following passwords are valid?hello, goodbye, Maker1, dog!three, Oops_again, 1augh#3

There are 26 letters(from A to Z) and 10 numbers(ranging from 0 to 9).  A 3-string password is formed in the way: letter number number .Answer Q4-5.Q4How many different passwords that can be formed if the numbers CAN be used repeatedly?*1 分您的回答 這是必填問題Q5How many different passwords that can be formed if the numbers CANNOT be used repeatedly?