The pole-zero plots of three discrete time systems P, Q and R on the z – McqOptions

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1.	The pole-zero plots of three discrete time systems P, Q and R on the z-plane are shown below.Which one of the following is TRUE about the frequency selectivity of these system?
A.	All three are high-pass filters
B.	All three are band-pass filters
C.	All three are low-pass filters
D.	P is a low-pass filter, Q is a band-pass filter and R is a high-pass filter
Answer» C. All three are low-pass filters

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