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diff --git a/692/CH2/EX2.7/P2_7.sce b/692/CH2/EX2.7/P2_7.sce
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+//EXAMPLE 2.7,Example of Power signal
+clear ;
+clc ;
+
+Sum=0;
+N=1:10000;
+    for i=1:length(N)
+     h1= 3*((-1)^i);
+     h=h1^2;
+    end
+
+Energy = sum(h);
+  if  (Energy/(2*(length(N))+1)<%inf ) then
+  disp ('Power Signal') ;
+  disp(Energy/2,'Power Signal = ');
+  else
+  disp ('Not a Power Signal') ;   
+  end