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diff --git a/752/CH4/EX4.15.1/4_15_1.sce b/752/CH4/EX4.15.1/4_15_1.sce
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+clc;
+// page no 141
+// prob no 4_15_1
+//mixer with noise fig. 20dB preceded by amplifier with noise fig. 9dB is given
+f1=9;//Noise fig for amplifier
+f2=20;//Noise fig for mixer
+g=15;//power gain
+//Converting dB in power ratio
+F1=10^(f1/10);
+F2=10^(f2/10);
+G=10^(g/10);
+//Determination of overall noise fig. reffered at i/p
+F=F1+(F2-1)/G;
+//converting in dB
+FdB=10*log10(F);
+disp('dB',FdB,'The overall noise fig is');
+\ No newline at end of file