The pattern adds 3 squares per figure: Figure 1 has 2, Figure 2 has 5, Figure 3 has 8.<br>Formula: 3n - 1 squares for Figure n.<br>Figure 6: 3 x 6 - 1 = 17 squares.<br>29 squares: 3n - 1 = 29, so n = 10.<br>Figure 20: 3 x 20 - 1 = 59 squares.<br><br>Final Answer: Figure 6 = 17, Figure 10, Figure 20 = 59