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Carol spent exactly $1 for some 5¢-stamps and some 13¢-stamps. How many 5¢-stamps did she buy?

Dec 17, 2017 02:42:26 UTC

I have a drawer which contains 40 socks in the following numbers and colors: 12 tan, 9 brown, 11 gray, and 8 blue. Suppose I am blindfolded. What is the fewest number of socks I must pick from the drawer to be absolutely certain that I have two socks of the same color among those I have picked?

Dec 17, 2017 03:11:01 UTC