Question 358426
We pick up the number of people in either cases : 
 

 p=(math(male)+math(female)+sci(male)+eng(male))/36=(4+6+5+1)/36=16/36=8/18=4/9
 

or we take the sum of people in math and male, less people both, since this would be counted 2 times : 
 
 p=(math+male-math&male)/36=(10+12-6)/36=16/36