How many four-digit numbers can you form from the numbers 1, 2, 3, 4, 5, 6, 7, 8, and 9
(a) if you use each digit only once? \

i know the answer is 3,024 im just wondering how

3,024

Step-by-step explanation:

There are digits 1, 2, 3, 4, 5, 6, 7, 8, and 9 (9 digits in total).

The first digit of 4-digit number can be selected in 9 different ways (any of given digits can be chosen), then 8 digits remain.

The second digit can be selected in 8 different ways, then 7 digits remain.

The third digit can be selected in 7 different ways, then 6 digits remain.

The fourth digit can be selected in 6 different ways.

In total, there are

different ways.

21 i watched a 3 hr vid explaining it

step-by-step explanation:

du what else would it be

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