Ascience class has 3 girls and 1 boy in the seventh grade and 5 girls and 5 boys in the eighth grade. the teacher randomly selects a seventh grader and an eighth grader from the class for a competition. what is the probability that the students she selects are both boys

In the science class,
there are 3 girls and 1 boy (grade 7)
and          5 girls and 5 boys (grade 8)
There is a total of 14 pupils being 8 girls and 6 boys
The probability of choosing a boy will be 
Which can be simplified into  by dividing 2 from the numerator as well as the denominator.

Aand b is what i think