Question: Write down the elementary matrix corresponding to the following row operations on 4 4 matrices: (a) Add the third row to the fourth row.

Write down the elementary matrix corresponding to the following row operations on 4 × 4 matrices:
(a) Add the third row to the fourth row.
(b) Subtract the fourth row from the third row.
(c) Add 3 times the last row to the first row.
(d) Subtract twice the second row from the fourth row.

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