If a=1/sqrt(10)(3i+k)" and "b=1/7(2i+3j-...

If `a=1/sqrt(10)(3i+k)" and "b=1/7(2i+3j-6k)`, then the value of `(2a-b).[(a times b) times (a+2b)]` is

A

3

B

-5

C

-3

D

5

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The correct Answer is:

B

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