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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,
I=100010001, then, A2+9I=1511711131171121.

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