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, what a delightful question! You can create 24 different 4-digit numbers using the digits 2, 5, 7, and 8. Each digit can be used only once in each number, creating a variety of unique combinations that can bring a lot of joy and creativity to your mathematical journey. Just like painting a happy little tree, each number you create is special and adds a unique touch to the canvas of numbers.
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.