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Question

If the points (5,4,2),(8,k,−7) and (6,2,−1) are collinear, then k=

A
2
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C
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D
1
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Solution

The correct option is A 2
For collinear points in 3Dimensional.
Their determinant should be zero.
∣ ∣5428k7621∣ ∣=0
5(k+14)4(8+42)+2(166K)=0
17k34=0
k=2

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