How many elements are in the set {whole numbers between 3 and 15}?

11

12

13

We are asked to determine the number of elements in the set containing whole numbers between 3 and 15. In this case, the numbers included in the set are 4,5,6,7,8,9,10,11,12,13, and 14. Upon counting, there are 11 elements all in all. Hence the answer to this problem is A. 11

15-3+1=13

So the answer to your question is 13