Question 86092
Lets represent the visual sequence as a sequence of numbers. I'm going to count the number of triangles in each term and use that as the number. For instance, the first term has one triangle, so the sequence starts with 1. The 2nd term has 4 small triangles, so the next number is 4, etc. So the sequence looks like this


1,4,9,...


Now this looks like the sequence of perfect squares. Notice that this sequence increments by an odd number each time Also notice that to go from 1 to 4, you add 3. To go from 4 to 9, add 5. So to go from 9 to ?, simply add 7 (the next odd number). Finally to go from 16 to ?, just add 9 to get 25. So the fifth step would have 25 small triangles.


So the answer is B)