- Eleven girls are standing around a
circle. A ball is thrown
clockwise around the circle. The
first girl, Ami, starts with the ball, skips the next three girls and
throws the ball to the fifth girl, who then skips the next three girls
and throws the ball to the ninth girl.
If the pattern continues, including Ami’s initial throw, What is
the least number of throws necessary for the ball to return to Ami?
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