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.

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I simply used the below code it worked fine

 int count=0;


int a[]={1,2,3,4,5,6};
int b[]={2,3,4,5,6,7,8};

for(int i=0;i<6;i++)
{
    for(int j=0;j<7;j++)
    {
        if(a[i]==b[j])
        {
            count++;
        }
    }
}
System.out.print(count);

select count(*) from (select * from a intersect select * from b) as m