If A is a square matrix of order n such that its elements are polynomial in x and its r-rows become ….

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If A is a square matrix of order n such that its elements are polynomial in x and its r-rows become identical for x = k, then

Options :-

1. (x - k)^r is a factor of |A|
2. (x - k)^{r - 1} is a factor of |A|
3. (x - k)^{r + 1} is a factor of |A|
4. (x - k)^r is a factor of A

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