three interviewers , a , b , and c are interviewing 40 applicants . only with three interviewers ' admission can an applicant be admitted . if interviewer b admitted 15 applicants , a admitted 17 applicants , and c admitted 20 applicants , at least how many applicants get the admission ?
if b admitted 15 are overlapping with a admission of 17 but c does not overlap with anybody . then no student will get nod from all the 3 . hence 0 student will get admission . answer : d
subtract(add(add(15, 17), 20), 40)