For example, if the required number is 3 and the factorial formula is 1×2×3, the product obtained is 6, 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. ..
Factorial factor is a mathematical term. = 1× 2× 3× …× n or n! =n×(n- 1)！
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