The angle between the lines whose direct...

The angle between the lines whose direction- ratios are `lt 2 , 1 , 2 gt and lt 4 , 8 , 1 gt ` is :

A

`cos^(-1) (3/2)`

B

`cos^(-1) (2/3)`

C

`cos^(-1) (10/3)`

D

`cos^(-1) (1/3)`

Verified by Experts

The correct Answer is:

B

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