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diff --git a/3860/CH3/EX3.25/Ex3_25.txt b/3860/CH3/EX3.25/Ex3_25.txt
new file mode 100644
index 000000000..101ca6eae
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+++ b/3860/CH3/EX3.25/Ex3_25.txt
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+ 
+ f(a,b,c,d) = summation of minterms(0,1,4,5,10,11,14)
+
+ The function f'(a,b,c,d) = summation of minterms(2,3,6,7,8,9,12,13,15)
+
+        a'b' a'b  ab   ab' 
+
+ c'd'    1    1    
+
+ cd'     1    1 
+
+ cd                     1
+
+ cd'             1      1
+
+ The one minimum solution for f and the two equally good solution ofr sum of products for f' are
+
+  f = a'c' + ab'c + acd'
+
+ f' = ac' + a'c + abd
+
+  f' = ac' + a'c + bcd
+\ No newline at end of file