Three closed boxes have either white marbles, black marbles or both, and they are labeled white, black and both. However, you’re told that each of the labels are wrong. You may reach into one of the boxes and pull out only one marble. Which box should you remove a marble from to determine the contents of all three boxes?
The one labeled both. Since you know it’s labeled incorrectly, it must have all black marbles or all white marbles. After you determine what it contains, you can identify the other two boxes by the process of elimination.
In 2012 a class was divided into 2 groups. Their assignment was to find the names of at least 3 children who were born on the same day from 5 different months of 2011. These were the results:
Group 1 August 20: Oliver, William, and Adam. January 3: John, Alice, and Ken. September 7: Bruce, Shane, and Peter. June 11: April, Patrick, and Bobby. July 19: Trent, Julie, and Charles.
Group 2 March 1: Karl, Willie, and Patty. February 29: Blake, Kobe, and Wayne. December 24: Kyle, Chad, and Zoe. May 12: Matthew, Manny, and Adrian. November 20: Greg, Fiona, and Elizabeth.
The members of group 2 got an F on the assignment. Why?