6. In the square ABUD on has marked the diagonal AC. There is a particle in the point A. 1which starts walking over the square each time choosing a vertex to 1which there is a route from the I.rertea it actually stays in (different from the one when: it stays} c Find the probability that after many steps it stays in the point D. . Find the probability that it reaches 6' before B? o What is the expected number of steps after which it rst time returns to the point A