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diff --git a/2863/CH2/EX2.30/ex2_30.sce b/2863/CH2/EX2.30/ex2_30.sce
new file mode 100755
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+++ b/2863/CH2/EX2.30/ex2_30.sce
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+//chapter 2
+//P=k(Ta+Tr)B
+printf("\n");
+Ta=15;
+Tr=20;
+b=4*10^6;
+//part a
+k=1.38*10^-23;
+Pb=k*(Ta+Tr);
+printf("the power per unit bandwidth is %gW/hz",Pb);
+//part b
+P=Pb*b;
+printf("\nthe available noise power is %gW",P);