Socks

Allie has a drawer with several pairs of white socks and yellow socks.

One early morning, the bulb burned out and Allie needed to pick her socks in the dark.

What is the minimum number of socks (the color doesn't matter) that she should pick to make sure she gets at least one pair (two socks of same color)?

Image credit: Flick Dwight Sipler. Image cropped
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