Higher Study | Mathematics | Vector Algebra

If three or more than three vectors lie in the same plane then they are called as 
For any three vectors a, b and c (a – b) . (b + c) × (c + a) is equal to
The area of the square, one of whose diagonals is 3î + 4ĵ is
Which one of the following is a subspace of the vector space ℝ3?
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