The centre of \( a \) square \( A B C D \) is at the origin and point \( A \) is represented byz...
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0The centre of \( a \) square \( A B C D \) is at the origin and point \( A \) is represented byz. The centroid of \( \triangle B C D \) is represented by
(A) \( \frac{z_{1}}{3} \)
(B) \( -\frac{z_{1}}{3} \)
(C) \( \frac{i z_{1}}{3} \)
(D) \( -\frac{i z_{1}}{3} \)
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