This is a markov chain question.
I know the def of regular and it says it the matrix does not have any non-zero terms or no negative terms then its regular. This is for p ^n though.
so p might have zero terms but then p ^3 might not.
But this matrix is 4x4 and so how to u calculate it ??
(0.1 0.5 0 0.4)
(0 0 1 0 )
(0 0 0 1 )
(1 0 0 0 )