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If vec a = 1/sqrt10 (3i+k) and vec b = 1...

If `vec a = 1/sqrt10 (3i+k)` and `vec b = 1/7 (2i+3j-6k)` then the value of `(2 vec a - vec b) . [(vec a xx vec b) xx vec a+ (vec a xx vec b) xx 2 vec b]` is

A

3

B

- 5

C

- 3

D

5

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The correct Answer is:
B
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