Which of the three is incorrect and what algebraic step produced this wayward result? What is the full correct result for that particular result of k?
Looking at the rref matrix, I see that (ii) and (iii) are true by plugging in values for k=4 and k=5.
Going back to (i), that must be the untrue statement. But, if you put k=3, the denominator of the last column is undefined.
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