Factorial

A factorial, written $n!$, is the product of all positive integers from $1$ up to $n$; for example $5!=5\times4\times3\times2\times1=120$. By definition $0!=1$.

Factorials count the number of ways to arrange $n$ distinct objects in a row and appear in permutation and combination formulas.

You meet Factorial in the Permutation and Combination chapter of SPM Additional Mathematics. Knowing the term precisely matters in the exam: questions often hinge on reading a keyword correctly, and because SPM marking is analytic, using the right definition in your working helps secure method marks.

Our teachers make sure a student can not only recite what Factorial means but use it fluently in a full solution.

Because the SPM Add Math paper is bilingual (BM/EN), it helps to know this term in each language: Factorial (EN) · Faktorial (BM) · 阶乘 (中文)

Other key terms from the Permutation and Combination chapter you may want to check:

• Multiplication Rule
• Permutation
• Combination
• Circular Permutation
• Arrangement of Identical Objects