P={{.1,.2,.3,.4},{.2,.2,.3,.3},{.5,0,.5,0},{.6,.2,.1,.1}};
MatrixForm[P]
MatrixForm[MatrixPower[P,4]]
{.25,.25,.25,.25}.MatrixPower[P,4]
{1,2,3,4}.%
{1,4,9,16}.%%-((%)^2)

.25*.3*.5*.4

.25*1.2*.5*.4