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Let A be a square matrix of order 3 whos...

Let A be a square matrix of order 3 whose all entries are 1 and let `I_3` be the identity matrix of order 3. Then the matrix `A-3I_3` is

A

invertible

B

orthogonal

C

non-invertible

D

real skew symmetric matrix

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The correct Answer is:
C
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