The number of triangles which is expected to be in the 5th figure in the sequence should be 5 triangles.
- Analysing the sequence, the number of triangles in the first figure is 1.
- The number of triangles in the second the figure is 2 and the third has 3 triangles.
- This means that, the number of triangles in each figure increases by 1.
- The number of figure 5 will thus have triangles corresponding to 5.
Therefore, since the number of triangles in each figure corresponds to the number which the figure occupies in the sequence, then the 5th figure will have 5 triangles.
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