-1
0
1
2
Correct answer is C
Recall that a unit matrice is a diagonal matrix in which the elements in the leading diagonal is unity. Therefore,
I3 = (100010001)
I3 = +1|1001|−0|0001|+0|0100|
I3 = +1(1 - 0) - 0(0 - 0) + 0(0 - 0)
= 1(1)
= 1
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