Question Video: Evaluating Numerical Expressions Involving Factorials Mathematics • Second Year of Secondary School

Video Transcript

Evaluate two factorial times three factorial.

First of all, we need to know what a factorial is. This exclamation mark represents factorial. A factorial is the product of an integer and all the integers below it. Two factorial is then two times one. And three factorial would be three times two times one. Two times one is two. Two times three is six. Six times two is 12. And 12 times one is 12. Two times one times three times two times one equals 12. And so, we can say that two factorial times three factorial equals 12.