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				| 1. | What is the general formula that represent the phase of the poles of transfer function of normalized low pass Butterworth filter of order N? | 
| A. | ( frac{ }{N} k+ frac{ }{2N} ) k=0,1,2 N-1 | 
| B. | ( frac{ }{N} k+ frac{ }{2N}+ frac{ }{2} ) k=0,1,2 2N-1 | 
| C. | ( frac{ }{N} k+ frac{ }{2N}+ frac{ }{2} ) k=0,1,2 N-1 | 
| D. | ( frac{ }{N} k+ frac{ }{2N} ) k=0,1,2 2N-1 | 
| Answer» E. | |