Consider the linear system of equations , where is a matrix and is a matrix.
Find the correct statement.

Question

Consider the linear system of equations   , where    is a    matrix and    is a    matrix. Find the correct statement.

Answer

If    is not invertible, then the system    does not have solutions.

Answer

If    for some   , then    is not invertible.

Answer

If the system    does not have solutions, then there exists    such that   .

Answer

If the system    has a unique solution, then    is invertible.

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