Please help me ISI QUESTION

Posted by SINGHAM on Mar 29, 2014; 4:26am
URL: http://discussion-forum.276.s1.nabble.com/Please-help-me-ISI-QUESTION-tp7585667.html

 Let X be the set of positive integers denoting the number of tries it takes the Indian
cricket team to win the World Cup. The team has equal odds for winning or losing
any match. What is the probability that they will win in odd number of matches?

 I even don't understand the question itself!

Please say me why we have answer 2/3 ?