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diff --git a/74/CH3/EX3.21/example21_sce.sce b/74/CH3/EX3.21/example21_sce.sce
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+//chapter 3
+//example 3.21
+//page 167
+Ro=100;
+x=0.00392;
+T1=25;//temp at 25c
+R(25)=Ro*(1+(x*T1));
+disp(R(25))// resistance at 25 degree
+T2=100;
+R(100)=Ro*(1+(x*T2));
+disp(R(100))//resistance at 100 degree
+\ No newline at end of file