Arrange the points: $A (1, 2 - 3), B (- 1, 2, - 3), C (- 1, - 2 - 3)$ and $D (1, - 2, - 3)$ in the increasing order of their octant numbers:

A, B, C, D

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B, C, D, A

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C, D, A, B

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D, C, B, A

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Solution

The correct option is C $A, B, C, D$
Octant $I$ $I I$ $I I I$ $I V$ $V$ $V I$ $V I I$ $V I I I$
Signs: $+, +, +$ $-, +, +$ $-, -, +$ $+, -, +$ $+, +, -$ $-, +, -$ $-, -, -$ $+, -, -$
Based on this, increasing order is
$A, B, C, D$

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Octant	$I$	$I I$	$I I I$	$I V$	$V$	$V I$	$V I I$	$V I I I$
Signs:	$+, +, +$	$-, +, +$	$-, -, +$	$+, -, +$	$+, +, -$	$-, +, -$	$-, -, -$	$+, -, -$