Question

Let 𝑀 = $\begin{bmatrix} K & 1 & 1 \\\ 1 & K & 1 \\\ 1 & 1 & K \end{bmatrix}$and I3 be the identity matrix of order 3. If the rank of the matrix 10 𝐼3 − 𝑀 is 2 then 𝑘 is equal to _____ (in integer).

Answer 1

The correct answer is: 8