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Let \mathbfA=\beginbmatrix 1 & \tfrac151 \\[2pt] 0 & 1 \endbmatrix. If \mathbfB=\beginbmatrix 1 & 2 \\ -1 & -1 \endbmatrix\mathbfA\beginbmatrix -1 & -2 \\ 1 & 1 \endbmatrix, then the sum of all the elements of the matrix \displaystyle ∑_n=1^50 \mathbfB^n is equal to: | Watch the step-by-step video solution for this NIMCET PYQ.