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Q.) Let us define the length of a vector a i + b j + c k as |a| + |b| + |c|. This definition coincides with the usual definition of length of a vector a i + b j + c k if and only if

[A]a = b = c = 0

[B]any two of a, b and c are zero

[C]any one of a, b and c is zero

[D]a + b + c = 0

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