Question:medium

Let \(\R\) be the set of real numbers, U be a subspace of \(\R^3\) and M ∈ \(\R^{3×3}\) be the matrix corresponding to the projection on to the subspace U.
Which of the following statements is/are TRUE ?

Updated On: Nov 25, 2025
  • If U is a 1-dimensional subspace of \(\R^3\), then the null space of M is a 1-dimensional subspace.
  • If U is a 2-dimensional subspace of \(\R^3\), then the null space of M is a 1-dimensional subspace.
  • M2 = M
  • M3 = M
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The Correct Option is B, C, D

Solution and Explanation

The correct option is (B): If U is a 2-dimensional subspace of \(\R^3\), then the null space of M is a 1-dimensional subspace; (C): M2 = M; and (D): M3 = M.
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