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# If Matrix $A=[a_{ij}]_{2\times 3},$ where$a_{ij} \begin{array}{ 1 1}=1\;if\;i\neq j\\=0\;if\;i=j\end{array}$ then $\;A^2\;$ is equal to:

$(A)\quad I\quad(B)\quad A\quad(C)\quad 0\quad (D)\quad none\;of\;these$
Can you answer this question?

(A) is the right answer.
answered Mar 11, 2013