Teaching UP TGT Mock Test Series 2025 Mathematics Three Dimensional Geometry

Which of the Following condition satisfies the Orthogonality of 2 spheres? 

1
2uu1 + 2vv1 + 2ww1 = d + d1 
2
2u2u1 + 2v1v2 - 2w1w2 = d1 + d2 
3
2u1u2 + 2v1v2 + 2w1w2 = d1 - d2
4
2u1u2 - 2v1v2 - 2w1w2 = d1 - d2
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