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Consider a Δ ABC where A(1, 3, 2), B(–2, 8, 0) and C(3, 6, 7). If the angle bisector ∠ BAC meets the line BC at D, then the length of the projection of the vector AD J JJG on the vector AC J JJ G is :

1. 37 2 38
2. 39 2 38
3. 19
4. 38 2

Correct answer: 37 2 38

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