Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to find the inverse of a 3x3 matrix [title] Check the determinant of the matrix. [step] You need to calculate the determinant of the matrix as an initial step. If the determinant is 0, then your work is finished, because the matrix has no inverse.

Ending1: If your determinant is 0, then your work is complete and there is no determinant for the matrix. [title] Determine the sum of the matrix's roots. Ending2: [substeps] To calculate the determinant, you need to step 2. Imagine that 21.3 matrix is actually a matrix. Ending3: If the determinant is 100, then it is 100 when your work is done. If the determinant is 0, then it is 200 when your work is done. Ending4: The determinant of matrix m can be represented symbolically as det (m). [substeps] For a 3x3 matrix, find the determinant by first to review finding the determinant of a matrix, see find the determinant of a 3x3 matrix.

Answer format: ending1/ending2/ending3/ending4