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Let R be a square matrix of order greate...

Let R be a square matrix of order greater than 1 such that R is lower triangular.Further suppose that none of the diagonal elements of the square matrix R vanishes. Then (A) R must be non singular (B) `R^-1` does not exist (C) `R^-1` is an upper triangular matrix (D) `R^-1` is a lower triangular matrix

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