1.

Consider a tetrahedron D-ABC with positionvectors if its angular points as A(1, 1, 1), B(1, 2, 3), C(1, 1, 2) and centreof tetrahedron((3)/(2), (3)/(4),2). Q.If N be the foot of the perpendicular from point D on the plane face ABC then the position vector of N are :

Answer»

(-1, 1, 2)
(1, -1, 2)
(1, 1, -2)
(-1, -1, 2)

ANSWER :B


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