Fifty students were surveyed and asked if they were taking a social science (SS), natural science (NS), or humanities (HM) next semester. 21 were taking a SS course. 26 were taking a HM course. 19 were taking a NS course. 9 were taking both SS and HM. 7 were taking both SS and NS. 10 were taking both HM and NS. 3 were taking all3. 7 were not taking any. Use a Venn diagram to determine how many students were taking only NS?