Which of the following linear time invariant system is a purely recurs – McqOptions

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1.	Which of the following linear time invariant system is a purely recursive system?
A.	y(n) = (- sum_{k=1}^{N} a_k y(n-k)+ sum_{k=0}^{M} b_k x(n-k) )
B.	y(n) = ( sum_{k=1}^{N} a_k y(n-k)+ sum_{k=0}^{M} b_k x(n-k) )
C.	y(n) = (- sum_{k=1}^{N} a_k y(n-k)- sum_{k=0}^{M} b_k x(n-k) )
D.	y(n) = (- sum_{k=1}^{N} a_k y(n-k)+b_0x(n) )
Answer» E.

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