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Let I3 be the Identity matrix of order 3 then (I3)^-1 is equal to _________

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Let I3 be the Identity matrix of order 3 then (I3)^-1 is equal to _________

(a) 0

(b) 3I3

(c) I3

(d) None of the mentioned

This question was posed to me at a job interview.

I want to ask this question from Inverse of Matrices in chapter Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

1 Answer

+1 vote
by (1.4m points)
The correct option is (c) I3

The explanation: Idenity matrices are self invertible that is I3 x I3 = I3.

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