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If veca is perpendicuar to vecb and vecc...

If `veca` is perpendicuar to `vecb and vecc` `|veca|=2, |vecb|=3,|vecc|=4` and the angle between `vecb and vecc is (2pi)/3, then [veca vecb vecc]` is equal to (A) `4sqrt(3)` (B) `6sqrt(3)` (C) `12sqrt(3)` (D) `18sqrt(3)`

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