The number of permutations of 20 things taken 20 at a time is 20 factorial or 2,432,902,008,176,640,000.
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The tables at the party were beautifully decorated.The chairs are broken.The books are arranged on bookshelves.
If the tiles cannot be arranged into a rectangle or square it is a prime number.
Six squares can be arranged to form various shapes depending on their orientation. For example, they can be arranged in a straight line, creating a rectangular shape, or they can be arranged in a 2x3 grid to form a larger rectangle. Alternatively, they could be positioned to create an "L" shape or other geometric configurations. The specific shape will depend on how the squares are positioned relative to each other.
If no digit can be repeated then there are 5 combinations, abcd, abce, abde, acde and bcde. If you regard abdc as different from abcd then each of the 5 basic sets could be arranged 24 ways and the total would be 120 combinations.