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+//Example 3.15
+//Program to Compute x3[n] where X3[k]=X1[k].X2[k]
+//x1[n]=[1,2,3,4]
+//x2[n]=[1,1,2,2]
+clear;
+clc ;
+close ;
+x1=[1,2,3,4];
+x2=[1,1,2,2];
+//DFT Computation
+X1=fft(x1,-1);
+X2=fft(x2,-1);
+X3=X1.*X2;
+//IDFT Computation
+x3=fft(X3,1);
+//Display sequence x3[n] in command window
+disp(x3,"x3[n]=");
+\ No newline at end of file