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The point which divides the join of (1,2) and (3,4) externally in the ratio 1:1 is
as we know that for the co ordinates of a point whic divides externally in ratio m:n(x,y)=(mx2-nx1)/m-n, (my2-my1)/m-nlet us take x1=1,y1=2x2=3 , y2=4m=1, n=1by the above formula(1*3-1*1)/1-1 (1*4-1*2)/1-1we will get x,y as infinity so we can say there is no point which divides line in ratio 1:1 externally for any line joining two points
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