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If in a parallelogram ABDC, the coordinates of A, B and C are respectively (1, 2), (3, 4) and (2, 5), then the equation of the diagonal AD is :

1. 5x + 3y – 11 = 0
2. 5x – 3y + 1 = 0
3. 3x – 5y + 7 = 0
4. 3x + 5y – 13 = 0

Correct answer: 5x – 3y + 1 = 0

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