Consider the following game: your friend has two ums with 10 balls each. She picks a ball from the first um and shows the number on it (call it f) to you. Then you guess Larger or Smaller and she picks a new ball from the second um. If the new ball's number's (s) greatness is guessed correctly with respect to the first ball then you get $s, if they are equal you get $ -s, otherwise you get nothing. What is the maximum expected return of this game