Phillip has a box of socks in his closet containing 12 red socks and 12 green socks. Phillip wants to be certain his socks match, but can't see the socks in his closet, the light is burned out. What is the fewest number of socks Phillip needs to take from the box in order to have two socks of the same colour?

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Three.
The possible combinations are 3 green, 2 green 1 red, 1 green 2 red or 3 red.