숫자 추리 8, 11, 4, 5, 21, 20, 11, 10, ()

숫자 추리 8, 11, 4, 5, 21, 20, 11, 10, ()

48.
8, 11, 4, 5, 21, 20, 11, 10, ()
23 = 8 + 11 + 4
46 = 5 + 21 + 20
69 = 11 + 10 + 48