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What is Discrete Time Fourier Transform (DTFT) of following signal?$$x(n) = a^n$$ where $$n \geq 0, -1 < a < 1$$
$$X(\omega) = \frac{1}{(1 - ae^{-j \omega})}$$
$$X(\omega) = \frac{1}{(1 + ae^{-j \omega})}$$
$$X(\omega) = \frac{a}{(1 - ae^{-j \omega})}$$
$$X(\omega) = \frac{a}{(1 + ae^{-j \omega})}$$
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