many questions.....

1) what is "total score" is that the sum of two tosses, by both players?

2) do you repeatedly play this game? then $3-$2 is one dollar, so you can win $6 eventually

maybe the 6 is a zero, then AFTER one play

P(X=3)=P(X=-2)=1/36 and P(X=0)=17/18