8*7*6*5*4 = 6720 of them.
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Yuo can make only one combination of 30 digits using 30 digits.
Oh, dude, you can make 24 different 4-digit numbers using the digits 2, 5, 7, and 8. It's like a combination lock, but with numbers. Just mix and match those digits and voila, you've got yourself a bunch of 4-digit numbers. Math can be fun, who knew?
You can make 24 numbers by rearranging the digits. However, you can make vastly more if you allow mathematical operations on the digits. For example, 3+5*8-6 = 37.
Oh, what a delightful question! You can create the biggest number by arranging the digits in descending order. So, by using all the numbers 1 to 9, the largest number you can make is 987654321. Just like painting, it's all about arranging things in a way that brings you joy and beauty.
If you only use each digit once the number is 6 (it is a simple permutation and 3!=6). If you can repeat the digits there are 9 possible 3-digit numbers that start with 6, 9 that start with 7, and 9 that start with 8, giving you 27 possibilities.