Start with the largest and end with the smallest
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This is known as arranging the numbers in ascending order.
Factorial: Denoted by the exclamation mark (!). Factorial means to multiply by decreasing positive integers. For example, 5! = 5 ∗ 4 ∗ 3 ∗ 2 ∗ 1 = 120.
5 1 6 2 7 3 8 4
There are 3 factorial ways to arrange the letters DDA, where factorial (denoted as 3!) is the product of all positive integers up to 3 (3 x 2 x 1). So, there are 6 different ways to arrange the letters DDA: DDA, DAD, ADD, DDA, DAD, ADD.
Negative integers, zero and the positive integers, together form the set of integers.