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diff --git a/992/CH3/EX3.4/ex3_4.txt b/992/CH3/EX3.4/ex3_4.txt
new file mode 100755
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+++ b/992/CH3/EX3.4/ex3_4.txt
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+//Caption:Program to Bandwidth required.
+//Exa:3.4
+clc;
+clear;
+close;
+//Given:
+w=10;//in KHz
+wm=2;//in KHz
+mf=w/wm;
+Bw=wm*8*2;
+printf("\n modulation index = %f ",mf);
+printf("\n Band width required = %f KHz",Bw);
+\ No newline at end of file