1.Let A={X=(x,y,z)T:PX=0 and x2+y2+z2=1}A = \{X = (x, y, z)^T : PX = 0 \text{ and } x^2 + y^2 + z^2 = 1\}A={X=(x,y,z)T:PX=0 and x2+y2+z2=1}, where P=(121−23−419−1)P = \begin{pmatrix} 1 & 2 & 1 \\ -2 & 3 & -4 \\ 1 & 9 & -1 \end{pmatrix}P=1−212391−4−1. Then the set AAA:a.is a singletonb.is an empty setc.contains more than two elementsd.contains exactly two elementsLogin to continueOnly logged in users canattempt or see the solution.
