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hey guys i'm not sure how to solve this question and was hoping for someone to help me out :s

(i'm studying for an exam and i'm not sure how they got the answer or if its right or wrong)

thanks in advance

A "pair" of socks is two socks of the same colour. i have 17 identical red socks and 12 identical blue socks in a bag. how many socks must i pull out of the bag ( while i'm blindfolded) to be sure of getting two pairs of socks, of wither colour?

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