Question

Matrix A when multiplied with Matrix C gives the Identity matrix I, what is C?

(a) Identity matrix

(b) Inverse of A

(c) Square of A

(d) Transpose of A

The origin of the question is Matrix in section Arrays Types of Data Structures & Algorithms I

The question was posed to me by my school principal while I was bunking the class.

Answer 1

Right option is (b) Inverse of A

Explanation: Any square matrix when multiplied with its inverse gives the identity matrix. Note that non square matrices are not invertible.