1.

Let OABC be tetrahedron, Letthe mid points of edges OA & OB and OC be Al, Bl, Cl respectively while those of edges AB, BC and AC be R, P and Q respectively. If OA is

Answer»

`QB_(1)^(2)=RC_(1)^(2)`
`QA_(1)^(2)=RC_(1)^(2)`
`QC_(1)^(2)=RC_(1)^(2)`
None

Answer :a


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