Question

What does an exclamation mark mean in math and how to solve it?

Answer 1

Answer:

Denoted by the exclamation mark (!). Factorial means to multiply by decreasing positive integers. For example, 5! = 5 ∗ 4 ∗ 3 ∗ 2 ∗ 1 = 120. Note: 0! = 1.

The Fundamental Counting Rule allows us to define the idea of factorial: Given Event A occurring ways, and Event B occurring ways, then the way both events can occur is × ways.

Therefore, if the first event can occur ways, the second event can occur − 1 ways, the third event can occur − 2 ways, etc. Which we could write as !

Step-by-step explanation:

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