Given A⃗+B⃗+C⃗+D⃗=0, which of the following statements is not correct? (a) A⃗, B⃗, C⃗ and D⃗ must...

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Given A⃗+B⃗+C⃗+D⃗=0, which of the following statements is not correct?
(a) A⃗, B⃗, C⃗ and D⃗ must each be a null vector.
(b) The magnitude of (A⃗+C⃗) equals the magnitude of (B⃗+D⃗).
(c) The magnitude of A⃗ can never be greater than the sum of the magnitudes of B⃗, C⃗ and D⃗.
(d) B⃗+C⃗ must lie in the plane of A⃗ and D⃗ if A⃗ and D⃗ are not collinear and in the line of A⃗ and D⃗, if they are collinear.

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