factorial
adj, n (mathematics 数) (of the) product of a whole number and all those whole numbers below it 阶乘; 阶乘的; 因数的
factorial 5 (represented as 5!), ie the product of 5
4 3
2 15的阶乘(记作5!, 为54321的乘积).
My dear friend, Mathilde. Let me tell you something. That necklace you borrowed from me wasn't a real diamond necklace. It wasn't valuable at all. The stones in the necklace were made of glass. It was worth five hundred francs at the most.