Without any fanfare, ACT makes subtle yet significant changes to its test each year, which runs from September to June. The public gets its first look at specific changes when ACT releases its December test booklet to students who purchase it. There are two noteworthy changes to the 2016-17 ACT math test, as shown in questions 30 and 55.
For the first time, ACT is testing basic knowledge of combinations and permutations as shown in question 30 on December’s test (74H). It’s located in the middle of the 60-question test, before they usually start asking the more difficult questions.
While ACT has included questions on determinants in the past, they also provided the required formula. December’s question 55 is the first one we’ve seen where students are expected to know the formula in this advanced math category.