add 12 to 12 and arrive at the number 24.
If you thought the answer was 24, you are not alone, but you missed a key mathematical symbol!
In mathematics, an exclamation mark after a number is not an exclamation of excitement.
It is a mathematical operation called a factorial.
A factorial of a whole number means multiplying that number by every positive integer below it down to one.Therefore, 4! does not mean a loud “four”.
It means 4 factorial, which is calculated as 4 × 3 × 2 × 1.
Let us do that math first: 4 times 3 equals 12.
Then,
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