ANSWERS: 3
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Each hair grows about 5 inches (12.7 cm) every year. This is around 0.034cm per day. Source: Thread @ http://www.adelaider.com
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Hair grows about .0164 inches a day or 6 inches a year. This depends on how well you take care of your hair of course.
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The average amount of hair growth is about 0.3 mm to 0.4 mm per day, which is the same as 1/2 inch of growth each month, or 6 inches a year if the hair is not trimmed. Source: http://www.aafp.org/afp/20030701/93.html, http://goliath.ecnext.com/coms2/gi_0199-5042337/Hooray-for-hair.html
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