Cathy is making labels using three letters (of the 26 in the alphabet) for each label. No two letters can be duplicated for any one label. What multiplication principle of counting is used to determine how many possible labels can be made?

Out of the 180 students at a summer camp, 72 signed up for canoeing. there were 23 students who signed up for trekking, and 13 of those students also signed up for canoeing. use a two-way table to organize the information and answer the following question: approximately what percentage of students signed up for neither canoeing nor trekking? 72% 40% 54% 98%