Math Chapter Wise Sets, Relations And Functions English MCQ DSSSB PGT 2021 Q.Which one of the following in not a convex set? AX = {(x, y): x ≥ 3, y ≤ 5} BX = {(x, y): x2 + y2 < 9} CX = {(x, y): 4 ≤ x2 + y2 ≤ 9} DX = {(x, y): x2 + y2 ≤ 9} Show answer Correct answer: X = {(x, y): 4 ≤ x2 + y2 ≤ 9}