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Question

If A=⎡⎢⎣12101−13−11⎤⎥⎦, then

A
A3+3A2+A9I3=0
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B
A33A2+A+9I3=0
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C
A3+3A2A+9I3=0
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D
A33A2A+9I3=0
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Solution

The correct option is D A33A2A+9I3=0
121011311A2=A.A=121011311121011311=430322645A.A2=12101131143092721117A33A2A+9I3=0

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