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diff --git a/692/CH6/EX6.5/P6_5.sce b/692/CH6/EX6.5/P6_5.sce
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+//EXAMPLE 6.9
+//Z-Transform of causal sequence
+clc;
+clear;
+//z=%z;
+syms n a z M N;
+x = a^n;
+X = nusum(x*(1/z)^n,n,-M,N);
+limit(X);
+disp(X,' X = ');
+\ No newline at end of file