Question

Si 9999 = 4, 8888 = 8, 1816 = 6, 1212 = 0, alors 1919 =?

Answer 1

réponse--

9999 has 4 enclosed areas and only one type of digit =4×1=4

8888 has 8 enclosed area and only one tile of digit =8×1=8

1816 has 2 enclosed area and 3 type of digits

2×3=6

so 1919 has two enclosed area and two type of digits =2×2=4

J'espère que ça aide.