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For P(-2, 3, 5), Q(1, 2, 3), R(7, 0, -1), which relation among the lengths holds?
APQ + QR = PR
BPQ = QR = PR
CPR + QR = PQ
DPQ + PR = QR
Answer & Solution
Correct answer: A. PQ + QR = PR
PQ = root 14, QR = 2 root 14 and PR = 3 root 14, so PQ + QR = PR and the points are collinear.
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