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diff --git a/692/CH6/EX6.3/P6_3.sce b/692/CH6/EX6.3/P6_3.sce
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+//EXAMPLE 6.3
+//Z-Transform 
+clc;
+clear;
+syms n a z M N;
+x = a^n;
+X = nusum(x*(1/z)^n,n,M,N-1);
+limit(X);
+disp(X,' X = ');