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 )