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diff --git a/1553/CH9/EX9.13/9Ex13.sce b/1553/CH9/EX9.13/9Ex13.sce
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+//chapter 9 Ex 13
+
+clc;
+clear;
+close;
+
+a=sqrt(2); b=nthroot(3,3);
+v=[a b];
+v=gsort(v,'lc','i');
+mprintf("%.3f > %.3f i.e b>a",v(2),v(1));