JEE Advanced 2020 Concept Recapitulation Test 2 Paper 2

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Question : 44 of 54

Marks: +1, -0

Let A=[

1	2	2
2	1	2
2	2	1

], then

A2−4A−5I3=O
A−1=‌
1
5
(A−4I3)
A3 is not invertible
A2 is invertible

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