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diff --git a/1553/CH31/EX31.1/31Ex1.sce b/1553/CH31/EX31.1/31Ex1.sce
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+//chapter 31 Ex 1
+
+clc;
+clear;
+close;
+S={'H','T'};
+E={'H'};
+sizeS=size(S,"c"); sizeE=size(E,"c");
+prob=sizeE/sizeS;
+printf("The probability of getting a head is %0.2f",prob);