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For a non-zero real number x, u, v, w if the points with position vectors A((x-u)i+xj+xk),B(x i+(x-v)j+xk),C(x i+xj+(x-w)k)andD((x-1)i+(x-1)j+(x-1)k) are coplanar, then (1)/(u)+(1)/(v)+(1)/(w) is equal to_________ |
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