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Let A (3,0, –1), B(2, 10, 6) and C(1, 2, 1) be the vertices of a triangle and M be the midpoint of AC. If G divides BM in the ratio, 2 : 1, then cos ( ∠ GOA (O being the origin) is equal to :

1. 15 1
2. 10 6 1
3. 30 1
4. 15 2 1

Correct answer: 15 1

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