JEE Math Practice Question
Let A = {X = (x, y, z)T: PX = 0 and x2 + y2 + z2 = 1} where $$P = \left[ {\begin{matrix} 1 & 2 & 1 \\ { - 2} & 3 & { - 4} \\ 1 & 9 & { - 1} \\ \end{matrix} } \right]$$, then the set A :
- A.is an empty set.
- B.contains more than two elements.
- C.contains exactly two elements.
- D.is a singleton.
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