Question

9999 = 4, 8888 = 8, 1816 = 6, 1212 = 0, entonces 1919 =

Answer 1

little mistake in question , question is ----->9999 = 4, 8888 = 8, 1816 = 3, 1212 = 0, entonces 1919 = ?
this series is little different as you can see in each 9, has one circle
then, total four 9 have four circles .
e.g., 9999 = 4

similarly, 8888 = 8 { each 8 has two circles and there are four 8 so, total circles = 2 × 4 = 8 circles}
1816 = 3 { because there are 2 circles in 8 and 1 circle in 6 then, 3 circle in two number so, total circles is 3}
1212 = 0 { there is no any circle in given number so, total circle = 0}
1919 = 2 { two 9 so, total circles = 2 }

hence, answer is 2