Let Wn denote the symmetric random walk starting at 0. Calculate Expectation of random walk

Let Wn denote the symmetric random walk starting at 0, that is p = 1/2 and Wo = 0. Let X denote the number of steps to the right the random walker takes in the first 6 steps. Calculate (a)E(X|W1=-1)(b)E(X|W1=1)(c) E(X|W.=1,W2=-1) (d)E(X|W=1,W2=-1,W=-1)