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Anonymous
It was discovered in 1952 after a young boy named Stephen Christmas was found to be lacking this exact factor, leading to hemophilia.
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No, 3 is a factor of 9.
9 is a factor of 1620.
No, 9 is a factor of 36.
No, 9 is a factor of 63.
Close ! 9 is a factor of 378, but not of 379.