Basics of Sets and Relations #2

i am entering right answer but some how it showing me worng asnwer. i think i am having problem in formet. could any one show me sample formate in which we have to write answer?

Answer is '5'

Because the elements of A U B are 2,3,4,5,6. The count would be 5.

I have a problem how to enter any data in editor for databases unions and intersections only.....

Enter 5 only and click on submit code

just input a number to solve this problem

The answer is 5. 5 digits are in both sets of numbers. 2, 3, 4, 5 and 6 are in both sets of numbers.

Why can we use Java to submit answers to such questions??

how to write answer an example All Domains Databases Relational Algebra Basics of Sets and Relations