Question 1189198
X=4,5,6,7 games.
X=5 games. 
X=6, 7 games for at least 6 games.
That is how I see the question. They aren't asking for number of ways (two ways to have a 4 game series, for example). Without probability, there is no way to say likelihood.
Exactly 5 games has 5 ways to happen, but they aren't asking that, either, since x represents the total number of games and not wins or losses by either team.