NCERT Figure it Out 1 - Q2 - Exploring Some Geometric Themes

Question: Find the number of holes, and the triangles that remain at each step of the shape sequence that leads to the Sierpinski Triangle.

Answer: Remaining triangles Tn = 3^n; holes Hn = (3^n - 1)/2 (H0 = 0).

Full step-by-step NCERT solution with diagrams on Something by Zero.