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Spectrum of a signal x(t), sampled at period T, is given by:
$$X_s(f) = \sum_{n = -\infty}^{\infty} X\left(f - \frac{n}{T}\right)$$
$$X_s(f) = \sum_{n = -\infty}^{\infty} X\left(nf - T\right)$$
$$X_s(f) = X\left(f - \frac{n}{T}\right)$$
$$X_s(f) = \sum_{n = -\infty}^{\infty} X\left(f - nT\right)$$
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