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diff --git a/992/CH3/EX3.3/ex3_3.txt b/992/CH3/EX3.3/ex3_3.txt
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+//Caption:Program to calculate modulation index.
+//Exa:3.3
+clc;
+clear;
+close;
+//Given:
+Bw=12;//in KHz
+Mod_mn=300;
+Mod_mx=3000;
+dev=6;//in KHz
+m1={(Bw-dev)*1000}/Mod_mn;
+m2={(Bw-dev)*1000}/Mod_mx;
+printf("\n 1)modulation indexat 300Hz = %f ",m1);
+printf("\n 2)modulation indexat 3000Hz = %f ",m2);
+\ No newline at end of file