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A $3 \times 3$ matrix $P$ is such that, $P^{3}=P$. Then the eigenvalues of $P$ ܲ are

  1. $1, 1, −1$
  2. $1, 0.5 + ݆j0.866, 0.5 − ݆j0.866$ 
  3. $1,−0.5 + ݆j0.866, −0.5 − ݆j0.866$
  4. $0, 1, −1$
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