Chapter 8.1, Problem 5E

In Exercises 1-6, determine whether or not the matrix is stochastic.

$\left[\begin{array}{ccc}\frac{1}{6}& \frac{5}{12}& 0\\ \frac{1}{2}& \frac{1}{4}& \frac{1}{2}\\ \frac{1}{3}& \frac{1}{3}& \frac{1}{2}\end{array}\right]$