SEPT. 16, 2007

You decide to save money by wearing your socks as mittens too. Three are yellow, three are red and seven are labeled “Sunday.” But all are mixed in your sock drawer. You’re embarrassed to wear the “Sunday” socks as mittens, and it’s too dark to see without turning on a light and waking your dog. So, you pull out socks at random. How many must you pull out to be sure you have a pair?