VectorHard
Question
If p.v. of vertices of a tetrahedron are î − ĵ 
, − î − ĵ − , − î ĵ + , and î + ĵ + then its centre is-
, − î − ĵ − , − î ĵ + , and î + ĵ + then its centre is-Options
A.origin
B.î + ĵ + 
C.
D.None of these
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