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Usin mid point formula
x1 + x2 /2, y1+y2/2
2-2/2, 2+1/2
o, 2
Conditions for collinear are :- a1/a2=b1/b2=, c1/c2
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(x,y)=(x1+x2/2,y1+y2/2)
={2+(-2)/2,3+1/2)
=(0/2,4/2)
=(0,4)
To show end points are collinear it is sufficient to show that sum of distances between start point to mid point and mid point to end point us equal to the distance between start point to end point.
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