Three tas are grading a final exam. there are a total of 60 exams to grade. (a) how many ways are there to distribute the exams among the tas if all that matters is how many exams go to each ta? (b) now suppose it matters which students' exams go to which tas. how many ways are there to distribute the exams? (c) suppose again that we are counting the ways to distribute exams to tas and it matters which students' exams go to which tas. the tas grade at different rates, so the first ta will grade 25 exams, the second ta will grade 20 exams and the third ta will grade 15 exams. how many ways are there to distribute the exams?

Apsychology student wishes to investigate differences in political opinions between business majors and political science majors at her college. she randomly selects 100 students from the 260 business majors and 100 students from the 180 political science majors. does this sampling plan result in a simple random sample? why or why not? no, because each group of 200 students in the sample does not have the same chance of being selected. yes, because each group of 200 students in the sample has the same chance of being selected. no, because each individual student does not have an equal chance of being selected. yes, because each individual student has the same chance of being selected.