The solid cube (or region) in the first octant bounded by the coordinate plane annd the planes x=a,y=b and z=c is

\(\displaystyle{0}\le{x}\le{a},{0}\le{y}\le{b}{\quad\text{and}\quad}{0}\le{z}\le{c}.\) The solid cube (or region) in the first octant bounded by the coordinate planes and the planes x=2,y=2 and z=2 is

\(\displaystyle{0}\le{x}\le{2},{0}\le{y}\le{2}{\quad\text{and}\quad}{0}\le{z}\le{2}.\)

\(\displaystyle{0}\le{x}\le{a},{0}\le{y}\le{b}{\quad\text{and}\quad}{0}\le{z}\le{c}.\) The solid cube (or region) in the first octant bounded by the coordinate planes and the planes x=2,y=2 and z=2 is

\(\displaystyle{0}\le{x}\le{2},{0}\le{y}\le{2}{\quad\text{and}\quad}{0}\le{z}\le{2}.\)