How does an element in $I^n(R/J)$ looks like if $R$ is a ring and $I,J$ are ideals?

Question

Let $R$ be a ring, $I$, $J$ ideals then how does an element of $I^n(R/J)$ looks like. I know that an element of $I^n$ is of the form $(x_1x_2...x_n)$ for $x_i\in I$ but then do I multiply it with $r+J$ for some $r\in R$?

Thanks for your help