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diff --git a/752/CH4/EX4.13.1/4_13_1.sce b/752/CH4/EX4.13.1/4_13_1.sce
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+clc;
+// page no 139
+// prob no 4_13_1
+//Noise fig. of an amplifier is 7 dB with input SNR=35 dB
+SNRin=35;//SNR at i/p of amplifier
+F=7;//Noise figure of an amplifier
+//Determination of output SNR
+SNRout=SNRin-F;
+disp('dB',SNRout,'The value of output signal to noise ratio is ');
+\ No newline at end of file