Question
In which octants are following points lie?
$(\text {i})$ $(3,-1,2)$$\quad$ $(\text {ii})$ $(3,1,2)$

Answer

(i) Since for point $A - x$ coordinate is poisitive, $y$ coordinate is negative and $z$ coordinate is positive. So point A is in octant $\text {OXY'Z}$.
(ii) Since for point $B -x, y$ and $z$ coordinates are positive. So point B lies in octant $\text {OXYZ}.$

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