Extinction probabilities for three branching processes

Let the off-spring probability distributions of three branching processes be: I. $p_0=1/4,p_1=1/4,p_2=1/2$. II. $p_0=1/4,p_1=1/2, p_2=1/4$. III. $p_1=1/4,p_2=3/4$ (so $p_0=0$). Then, the extinction probabilities are respectively given by: