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Question

If A = [x110] and A2 is identity matrix, then x=

A
1
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B
1
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C
±1
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D
0
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Solution

The correct option is D 0
Since, A=[x110],A2=I
A2=[x110][x110]
[x2+1xx1]=[1001]
So x=0
Option D is the correct answer.

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