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If the angle between the lines whose direction cosines are `((2)/(sqrt(21)), (C )/(sqrt(21)), (1)/(sqrt(21)))` and `((3)/(sqrt(54)), (3)/(sqrt(54)), (6)/(sqrt(54)))` is `(pi)/(2)` then the value of C is

A

6

B

4

C

`-4`

D

2

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The correct Answer is:
b
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