Math Chapter Wise Modern Algebra English MCQ JSSC PGT 2018 Q.Which one of the following is NOT a subspace? A{(x, 2x): x ∈ ℝ } over ℝ. Bℚ over ℚ C{(x, y): x × y = 0} over ℝ. D{(x, y): 2x + 3y = 0} over ℝ. Show answer Correct answer: {(x, y): x × y = 0} over ℝ.