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The signs of the coordinates (x, y, z) of the point (−3, 2, −1) are
A(+, +, +)
B(−, −, −)
C(+, −, +)
D(−, +, −)
Answer & Solution
Correct answer: D. (−, +, −)
Reading off: x = −3 (negative), y = 2 (positive), z = −1 (negative). Sign pattern (−, +, −) uniquely identifies one octant of 3-D space.
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