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If the points (p ,\ q),\ (m ,\ n) and...

If the points `(p ,\ q),\ (m ,\ n)` and `(p-m ,\ q-n)` are collinear, show that `p n=q m` .

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The correct Answer is:
`G=((x_(1)+x_(2)+x_(3))/(3),(y_(1)+y_(2)+y_(3))/(3))`
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