0 votes 0 votes Recall that the value of the factorial function at a positive integer $n,$ denoted by $n!,$ is the product of the positive integers from $1$ to $n,$ inclusive. Also, we specify that $0! = 1.$ $\displaystyle{}\sum_{i=0}^{4} j\:!$ Set Theory & Algebra kenneth-rosen discrete-mathematics set-theory&algebra descriptive + – admin asked Apr 21, 2020 • edited Apr 21, 2020 by Lakshman Bhaiya admin 168 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.