Suppose we have a game with "spinner" to select the next move and that the spinner we use is fair (the pointer spins freely and there is no more friction in one point than any other). If the possible results of the spin are: {1-fwd, 2-fwd, 3-fwd, stay, 1-back, 2-back, 3-back, start-over}. What is the probability of a forward move?

2-back stay 3-back DMJ-2