Question

Consider the 4 × 4 matrix
$M = \begin{pmatrix} 0 & 1 & 2 & 3 \\\ 1 & 0 & 1 & 2 \\\ 2 & 1 & 0 & 1 \\\ 3 & 2 & 1 & 0 \end{pmatrix}$
If ai,j denotes the (i, j)th entry of M-1 , then a4,1 equals __________ (rounded off to two decimal places).

Answer 1

The correct answer is 0.15 - 0.18 (approx).