Question: ? ( 1 ) C o n s i d e r t h e d i s c r e t e t i
x[ n] = 4 ^ ( n) u[ n+ 2 ]
x( z) = ( 2 + 3 z^ ( - 1 ) ) ( 1 - 4 z^ ( - 1 ) ) ( 1 - 2 z^ ( - 1 ) )
S= \ sum_ ( n= - \ infty) ^ ( \ infty) x[ n]
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