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+clc;
+//page no 236
+//prob no. 7.7.1
+// refer to example 7.3.1
+// A broadcast receiver is tuned to a signal with
+fs=950;//in KHz
+IF=455;//in KHz
+m=[1,2];
+n=[1,2];
+f0=fs+IF;
+disp('The sum of frequencies are');
+for i=1:1:2
+    for j=1:1:2
+fu1=n(j)/m(i) *f0 + 1/m(i) *IF;
+disp(fu1);
+end
+end
+disp('The difference of frequencies are');
+for i=1:1:2
+    for j=1:1:2
+fu2=n(j)/m(i) *f0 - 1/m(i) *IF;
+disp(fu2);
+end
+end
+\ No newline at end of file