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diff --git a/752/CH4/EX4.12.2/4_12_2.sce b/752/CH4/EX4.12.2/4_12_2.sce
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+clc;
+// page no 137
+// prob no 4_12_2
+//SNR for three links is given in which Ist two have SNR 60 db & IInd 40 dB
+SNRdB(1)=60;//SNR is 60 dB for Ist link
+SNRdB(2)=60;//SNR is 60 dB for IInd link
+SNRdB(3)=40;//SNR is 40 dB for IIIrd link
+//Determination of power in watt
+for i=1:3
+snr(i)=10^(-SNRdB(i)/10);
+end;
+//Determination of overall SNR
+for i=1:3
+SNR=snr(i);
+end;
+//Determination of total SNR in dB 
+SNRdB=10*(-log10(SNR));
+disp('dB',SNRdB,'The value of output signal to noise ratio is ');
+\ No newline at end of file