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diff --git a/992/CH3/EX3.6/ex3_6.txt b/992/CH3/EX3.6/ex3_6.txt
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+//Caption:Program to modulation index.
+//Exa:3.6
+clc;
+clear;
+close;
+//Given:
+dev=100;//in KHz
+mod_f=15;//in KHz
+m1=dev/mod_f;
+m2=3*dev/mod_f;
+t=m1/m2;
+printf("\n modulation index = %f ",m1);
+printf("\n modulation index = %f ",m2);
+printf("\n when deviation is tripled m becomes = %ftimes ",t);
+\ No newline at end of file