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Points P(−2, 3, 5), Q(1, 2, 3) and R(7, 0, −1) are
AVertices of a right-angled triangle
BNon-coplanar
CCollinear (PQ + QR = PR)
DVertices of an equilateral triangle
Answer & Solution
Correct answer: C. Collinear (PQ + QR = PR)
PQ = √14, QR = 2√14, PR = 3√14. Since PQ + QR = √14 + 2√14 = 3√14 = PR, the three points are collinear.
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