Réponse :
b) la figure 4 = 3 puissance 3 = 27 triangles violets
la figure 7 = 3 puissance 6 = 729 triangles violets
la figure 20 = 3 puissance 19 = 1162261467 triangles violets
c) figure 10 = 3 puissance 9 = 19683 triangles violets
figure 13 = 3 puissance 12 = 531441 triangles violets
figure 15 = 3 puissance 14 = 4782969 triangles violets
figure 18 = 3 puissance 17 = 129140163 triangles violets
