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diff --git a/845/CH6/EX6.15/Ex6_15.sce b/845/CH6/EX6.15/Ex6_15.sce
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+//Example 6.15
+
+clc
+clear
+
+x = [1 2 5];
+y = [1 4 10];
+
+n = length(x);
+Y = 0;
+X = poly(0, "X");
+//X = 5;
+for i = 1:n
+    t = x;
+    t(i) = [];
+    p = 1;
+    for j = 1:length(t)
+        p = p * (X-t(j))/(x(i)-t(j));
+    end
+    Y = Y + p*y(i);
+end
+Y5 = horner(Y,3);
+disp(Y5,"f(3) = ")