Question 475954
There are two ways to find the cardinality of this set. You can either use the formula for an arithmetic sequence a_n = a_1 + (n-1)d, but I prefer finding the cardinality by doing a series of transformations on the set. For example, with the set {1,4,7,...,94} we can add 2 to each element (this will not affect cardinality) to get {3,6,...,96}, then divide each element by 3 to get {1,2,...,32} which obviously has 32 elements.