three interviewers , a , b , and c are interviewing 30 applicants . only with three interviewers ' admission can an applicant be admitted . if interviewer a admitted 10 applicants , b admitted 12 applicants , and c admitted 15 applicants , at least how many applicants get the admission ?
"if a admitted 10 are overlapping with b admission of 12 but c does not overlap with anybody . then no student will get nod from all the 3 . hence 0 student will get admission . answer : c"
subtract(add(add(10, 12), 15), 30)