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Vectors vec a and vec b are inclined at ...

Vectors `vec a and vec b` are inclined at an angle `theta=120^@`. If `|vec a|=1 |vec b|=2` then `[(vec a+ 3 vec b) times (3 vec a - vec b)]^2` is a)190 b)275 c)300 d)192

A

190

B

275

C

300

D

192

Text Solution

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The correct Answer is:
D
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