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If A(1, – 1, 2), B(5, 7, – 6), C (3, 4, – 10) and D(–l, –4, –2) are the vertices of a quadrilateral ABCD, then its area is :

1. 12 29
2. 24 29
3. 7 24
4. 7 48

Correct answer: 12 29

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