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If (-1,\ 2),\ (2,\ -1) and (3,\ 1) are a...

If `(-1,\ 2),\ (2,\ -1)` and `(3,\ 1)` are any three vertices of a parallelogram then the fourth vertex (a,b) will be such that (a) a=2 , b=0 (b) a= - 2, b=0 (c) a= - 2, b=6 (d) a=6, b=2

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RD SHARMA-COORDINATE GEOMETRY-All Questions
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  14. If points (1,\ 2),\ (-5,\ 6) and (a ,\ -2) are collinear, then a= ...

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