Suppose AB is a straight line segment. To divide the segment externally at point C in the ratio m:n, is it necessary for C to remain always outside of AB? I always thought C should be outside of AB, but the post in the link below confuses me http://www.transtutors.com/math-homework-help/vectors/section-formula.aspx Basically what is meant by external division of line segment by a point? Can anyone please clarify me? Thanks.