There are 10 pairs of socks (each pair is different) in a drawer in a dark room. Since you cannot see, how many  socks should you grab to ensure that you have at least one matching pair?

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter3: Solving Equation And Problems
Section3.7: Costs, Income, And Value Problems
Problem 18P
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There are 10 pairs of socks (each pair is different) in a drawer in a dark room. Since you cannot see, how many 
socks should you grab to ensure that you have at least one matching pair?

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