Question: Let $\mathrm{A}=\left[\begin{array}{lll}1 & 0 & 0 \\ 1 & 1 & 0 \\ 1 & 1 & 1\end{array}\right]$ and $\mathrm{B}=\mathrm{A}^{20}$. Then the sum of the elements of the first column of $\mathrm{B}$ is :
Correct Option: , 3
Solution:
Solution not required
