There are 3 green shirts, 2 white shirts, 5 blue shirts, and 7 red shirts in the wardrobe. What is the least number of shirts that you have to take out to make sure that you will have a matching pair?
Choose the correct answer:  A) 4  B) 7  C) 5  D) 2  E) 6
Since there are 4 colors, if you take 4 shirts, you could still have 1 shirt per color and not have a match.   Therefore, upon taking the 5th shirt, you will definitely have a match since the 5th shirt will form at least a pair with the 1st 4   So 4+1= 
<gadget id="calculator">4+1</gadget>
<output>5</output>
5   Answer is 5
<result>C</result>
There are 3 green shirts, 2 white shirts, 5 blue shirts, and 7 red shirts in the wardrobe. What is the least number of shirts that you have to take out to make sure that you will have a matching pair?