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Question

If A=123231312 and I is a unit matrix of 3rd order, then ​(A2+9I) equals


A

2A

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B

4A

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C

6A

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D

None of these

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Solution

The correct option is D

None of these


A=123231312A.A=A2=61171141171112,
9I=900090009, then, A2+9I=1511711131171121.


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