Which of the sets given below may represent the magnitudes of three vectors adding to zero? (a) ...

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Which of the sets given below may represent the magnitudes of three vectors adding to zero?
(a) \( 2,4,8 \)
(b) \( 4,8,16 \)
(c) \( 1,2,1 \)
(d) \( 0 \cdot 5,1,2 \).
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