I'm in desperate need of guidance. I have no idea how to answer this question and it is so frustrating for me because I've spent so long trying to figure it out! Thank you for your help

In a tournament, two players continue to play each other until one of them wins three games. If the probability that A wins any single game is 0.4 and the probability that B wins it is 0.5, find

a) the probability the first game is a draw

b) the probability A wins the first three games

c) the probability the tournament is just three games long

d) the probability A wins the first two games, and not the third.