There are 5 blue pillow covers, 3 white pillow covers, and 9 green pillow covers in the wardrobe. What is the least number of pillow covers that you have to take out to make sure that you will have a matching pair?	Select.
A) 4  B) 3  C) 12  D) 6  E) 9
Since there are 3 colors, if you take 3 pillow covers, you could still have 1 pillow cover per color and not have a match.   Therefore, upon taking the 4th pillow cover, you will definitely have a match since the 4th pillow cover will form at least a pair with the 1st 3   So 3+1= 
<gadget id="calculator">3+1</gadget>
<output>4</output>
4   4nswer is 4
<result>A</result>
There are 5 blue pillow covers, 3 white pillow covers, and 9 green pillow covers in the wardrobe. What is the least number of pillow covers that you have to take out to make sure that you will have a matching pair?