How many 3 digit numerical passwords are there if a digit can be repeated? Any math experts can help please and thank you

QUESTION:

How many 3 digit numerical passwords are there if a digit can be repeated?

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:

10 X 9 X 8 = 720

There are 720 passwords.

Step-by-step explanation:

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1000?

Step-by-step explanation:

step-by-step explanation: