Reduced Row Echelon Form Determine whether each of the matrices given in Problems 11–19is in RREF or not. If not, ex- plain which condition or conditions fail. Then use elementary row operations to obtain the RREF. 12. . [i 0 lo o 1. O 1 21 14. 0 1 2 lo 2 3] [1 3 ] 13. lo 0 2] 31 15. 0 0 0 [o o o] 16. 0 1 0 1 2 3 1 i 3 2 1 0 1 3 2 17. 0 0 0 1 0 0 0 0 18. 0 0 0 0 0 0 0 0. 0 0 0 0 1 3 0 -1 19. |о о 1 -2 0 lo 0 0 0 1

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