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Let A(3,0,-1), B(2,10,6) and C(1,2,1) be...

Let A(3,0,-1), B(2,10,6) and C(1,2,1) be the vertices of a triangle and M be the midpoints of AC. If G divide BM in the ratio, 2:1, then `cos(angleGOA)` (O being the origin) is equal to:

A

`1/sqrt(15)`

B

`1/(2sqrt(15))`

C

`1/sqrt(30)`

D

`1/(6sqrt(10))`

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The correct Answer is:
A
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