which of these is not correct?

Which of these is correct? => 1 1 2 < 1 3 8 or 5 2 4 > 5 4 8 or 1 1 4 < 1 3 8 or 2 3 4 = 2 3 8..

Which one is correct? => A triangle has four equal sides. or A triangle has three sides. or A triangle has no sides. or I don′t know...

Which of the following is correct? => Equal vectors have the same magnitude. or Equal vectors have the same direction. or Equal vectors do not have the same direction and magnitude. or Both (A) and (B)..

Which of the following is not correct? => A reflection is an isometry. or A reflection does not reverse orientation. or A reflection does not change size. or A reflection reverses orientation...

Which of the following is correct? => Translation changes the shape of a figure or Reflection changes the shape of a figure or Rotation changes the shape of a figure or Isometry does not change the shape of a figure..

Which of the following is correct? => Polar coordinate system is a line or Polar coordinate system is a Point or Polar coordinate system is a plane or Polar coordinate system is a space..

Which of the following is correct? => The diagonals of a kite bisect each other. or The diagonals of a kite are perpendicular to each other. or The diagonals of an isosceles trapeziod divide it into 4 congruent triangles. or A trapezoid has two pair of parallel lines...

Which of the following is correct? => Every point of a polar coordinate system has unique pair of polar coordinates. or Each pair of polar coordinates determine a unique point. or Every point of a polar coordinate system has 2 pairs of polar coordinates. or Each pair of polar coordinates ..

Which of the following is correct? => Every ordered pair of real numbers describes the position of a unique point of plane or Every ordered triple of real numbers describes the position of a unique point of space or Every ordered pair of real numbers describes the position of a unique poi..

Which of the following is correct ? => 2 n P r ≤ n C r or n P r ≤ n C r or n P r = n C r or n P r ≥ n C r..