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​​​​​The radian frequency value(s) for which the discrete time sinusoidal signal $x[n]=A \cos (\Omega n+\pi / 3)$ has a period of $40$ is/are $\_\_\_\_\_\_$.

  1. $0.15 \pi$
  2. $0.225 \pi$
  3. $0.3 \pi$
  4. $0.45 \pi$

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