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diff --git a/1583/CH3/EX3.3/NNID_Ex_3_3.sce b/1583/CH3/EX3.3/NNID_Ex_3_3.sce
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+clc
+//Chapter 3:Network noise and intermodulation distortion
+//example 3.3 page no 80
+//given
+NF1=2//first stage noise figure
+NF2=6//second stage noise figure
+F1=10^(NF1/10)//first stage noise factor
+F2=10^(NF2/10)//second stage noise factor
+G1=15.9//gain of first stage equivalent to 12dB
+G2=10//gain of second stage equivalent to 10dB
+F=F1+(F2-1)/G1//overall noise factor
+NF=10*log10(F)//noise figure of the two-stage systemm
+printf('the noise figure of the two-stage system is %f dB',round(NF*10)/10)