Two girls, Eva and Olga and three boys, Adam, Isaac and Urban play a ball game. When a boy has the ball, he throws it to another boy but never to the boy from whom he just received it. Eva starts the game by throwing the ball to Adam. Who will do the fifth throw?
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Eva did the first throw. Then Adam did the second.
"When a boy has the ball, he throws it to another boy but never to the boy from whom he just received it."
By this, the other two boys should do the third and fourth throws in some order, and return the ball to Adam for the fifth one.