Operator in Set Analysis

    I Prepare a sample for all four Operators in Set Analysis

    for example : we have a table that shows each customer buy which product (ball , book ,pen)

    for specifying how many customer buy product 1 or product  2 ,  I used '+' operator in expression

    for specifying How many customer buy both product 1 and product  2 ,  I used '*' operator in expression

    for specifying How many customer buy product 1 and do not buy product 2 , I used '-' operator in expression

    for specifying How many customer buy one of the product 1 or product 2 (don't buy both of products), I used '/' operator in expression

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