Given S is set for all real number. A is set for all even number, B is set for all positive integer, C is set for odd number represent the relationship between the sets with Venn diagram. This question is seems easy. However, there is a problem that how can we illustrate the three sets in circles. Set A and C are exclusive so they do not touch each other. However, For Set B, it is totally inclusive in Set A and C. How should we draw the Circle for Set B?