Seri bilangan 5-10-8-24-21-85 adalah

5 (x2) = 10
10 (-2) = 8
8 (x3) = 24
24 (-3) = 21
21 (x4) = 84
84 (-4) = 80
80 (x5) = 400
395 (-5) = 395
kalau 85 kayaknya nggak ada
maaf bgt yaa kalau salah

5 (x2) = 10
10 (-2) = 8
8 (x3) = 24
24 (-3) = 21