The chess clubs of two schools consist of, respectively, 8 and 9 players. Four members from each club are randomly chosen to participate in a contest between the two schools. The chosen players from one team are then randomly paired with those from the other team, and each pairing plays a game of chess. Suppose that Rebecca and her sister Elise are on the chess clubs at different schools. What is the probability that a. Rebecca and Elise will be paired? b. Rebecca and Elise will be chosen to represent their schools but will not play each other? c. either Rebecca or Elise will be chosen to represent her school?

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