Alexis G.

asked • 10/11/19

How do I solve this probability question?

Consider a four character password, where each character can be an upper or lower case letter or

a digit. No character can be used more than once (no repeats).

1) How many different passwords are possible?

2) How many different passwords have the character "A" in them?

3) How many different passwords are possible if the first character must be a capital letter, the

third character must be a digit, and the fourth character must be lower case?

Reno O. B.

For part 3, 26×59×10×26 are# possible choices. 26 represents possible capital letters, 59 represents characters available after 1st, 3rd, and 4th characters have been entered , 10 represents possible numbers, and 26 represents lowercase letters.


1 Expert Answer


Still looking for help? Get the right answer, fast.

Ask a question for free

Get a free answer to a quick problem.
Most questions answered within 4 hours.


Find an Online Tutor Now

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.