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JEE MAIN 2021 S2
27-07-2021 S2
Question
If $A=\left[\begin{array}{lll}1 & 1 & 1 \\ 0 & 1 & 1 \\ 0 & 0 & 1\end{array}\right]$ and $M=A+A^2+A^3+\ldots \ldots+A^{20}$, then the sum of all the elements of the matrix $M$ is equal to $\_\_\_\_$ .
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