Evaluate the Determinant $\left| \begin{array} { r r r } 1 & 1 & - 1 \\1 & 1 & 0 \\1 & 0 & 1\end{array} \right|$

Short Answer

Evaluate the determinant. $\left| \begin{array} { r r r } 1 & 1 & - 1 \\1 & 1 & 0 \\1 & 0 & 1\end{array} \right|$