Probability :Knock Out Tournament Of Ranked Players 
Thirty-two players ranked 1 to 32 are playing in a knockout
  tournament. Assume that in every match between any two players, the
  better-ranked player wins, the probability that ranked 1 and ranked 2
  players are winner and runner up respectively, is ?

I dont understand. Should'nt the player ranked 1 always be the winner as the better ranked guy always wins?

Yes, the player ranked number $1$ will win all of his matches, and will eventually win the tournament.
But you are asked what the probability is that the players ranked $1$ and $2$ will meet in the final (because only in this scenario, the ranked $1$ player will win, and the ranked $2$ player will be the runner-up).
For the two players to meet in the final, you need to avoid that they meet before the final, and this is what you need to find the probability of.
