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[" The value of "lambda" so that the points "P,Q,R,S" on the sides "],[OA,OB,OC" and "AB" of a regular tetrahedron are coplanar."],[" When "(OP)/(OA)=(1)/(3);(OQ)/(OB)=(1)/(2),(OR)/(OC)=(1)/(3)" and "(OS)/(AB)=lambda" is equal to "],[[" (a) "lambda=(1)/(2)," (b) "lambda=-1],[" (c) "lambda=0," (d) for no value of "lambda]]

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