How many 3-digit numerical passwords are there if a digit cannot be repeated?
1 answer:
The first digit of the password can be any of the ten digits - 10 possibilities.
A digit cannot be repeated, so the second digit can be any digit except the one you chose for the first digit - 9 possibilities.
The third digit can be any digit except the digits you chose for the first and second digit - 8 possibilities.
Using the rule of product:
There are 720 passwords.
A digit cannot be repeated, so the second digit can be any digit except the one you chose for the first digit - 9 possibilities.
The third digit can be any digit except the digits you chose for the first and second digit - 8 possibilities.
Using the rule of product:
There are 720 passwords.
You might be interested in
Answer:
No
Step-by-step explanation:
The upper Quartile is also known as the third quartile. And the greatest value is at the far right of the plot I placed an image below
