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In each of the following find the value...

In each of the following find the value of k for which the points are collinear.`(i)\ (7,\ 2),(5,\ 1),(3,\ k)(i i)\ (8,\ 1),(k ,\ 4),\ (2,\ 5)`

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The correct Answer is:
k= 4, (ii) k=3
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