Factorial calculation method

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Factorial factor refers to the required number obtained by multiplying 1 by 2 times 3 times 4.

For example, if the required number is 4, the factorial formula is 1×2×3×4, and the product is 24, that is, the factorial of 4. For example, if the required number is 6, the factorial formula is 1× 2× 3×…× 6, and the product is 720, which is the factorial of 6. For example, if the required number is n, the factorial formula is 1× 2× 3× …× n, and the product obtained is X, that is, the factorial of n. ..

Representation of factorial

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When expressing factorial, use "!" To show. Such as the factorial of x, it is expressed as x!

Factorial of numbers within 20

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Because the product is very large, the factor is usually difficult to calculate.

The factorial of 1 to 20 is as follows:

1! = 1,

2! =2,

3! =6,

4! =24,

5! = 120,

6! =720,

7! =5040,

8! =40320

9! =362880

10! =3628800

1 1! =399 16800

12! =47900 1600

13! =6227020800

14! =87 17829 1200

15! = 1307674368000

16! =20922789888000

17! =355687428096000

18! =6402373705728000

19! = 12 1645 100408832000

20! =2432902008 176640000

In addition, mathematicians define 0! = 1, so 0! = 1!

Question 2: What are the meanings of (,] and [,) in mathematics? The first one is the number on the left, not the number on the right. The second one is just the opposite.

Question 3: In mathematics? What is necessary and sufficient? Simply put, the left and right can push each other out.

Question 4: In mathematics.

For example: A, B, C and D are not zero. A: B = C: Dad = BC.

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