Which of the sets given below may represent the magnitudes of three vectors adding to zero?

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1, 2, 1 1,2 and 1 may represent the magnitudes of three vectors adding to zero. For example one of the vector of length 1 should make an angle of {135}^\circ with x axis and the other vector of length 1 makes an angle of {225}^\circ with x axis. The third vector of length 2 should lie along x axis.

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