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diff --git a/863/CH13/EX13.4/Ex13_4.txt b/863/CH13/EX13.4/Ex13_4.txt
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+//Caption:Determine the capacitance for flip flop design and triggering frequency 
+//Ex13.4
+clc;
+clear;
+close;
+R1=15//Resistor(in kilo ohm)
+R2=27//Resistor(in kilo ohm)
+t=250//time(in ns)
+R=R1*R2/(R1+R2)
+C=t/(0.1*R)
+f=10^6/(2.3*C*R)
+disp(f,C,'Capacitance(in pF) and Frequency(in Khz)=')
+\ No newline at end of file