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Mathematics
IMPORTANT
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Consider the planes P1: 2x+y+z+4=0, P2: y-z+4=0 and P3: 3x+2y+z+8=0. Let L1,L2,L3 be the lines of intersection of the planes P2 & P3, P3 & P1, and P1 & P2, respectively. Then,

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Important Questions on Three Dimensional Geometry

HARD
Mathematics
IMPORTANT
Let P be an arbitrary point having sum of the squares of the distance from the planes x+y+z=0, lx-nz=0 and x-2y+z=0 equal to 9 units. If the locus of the point P is x2+y2+z2=9, then the value of l-n is equal to