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An equilateral triangle has each of its sides of length `6c mdot` If `(x_1, y_1);(x_2, y_2)&(x_3, y_3)` are its vertices, has the value of the determinant `|x_1y_1 1x_2y_2 1x_3y_3 1|` is equal to: `192` b. `243` c. `486` d. `972`

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