Programming, Statistics.
Gacha Simulation Table rarity PDF CDF 1 3 0.945 0.945 2 4 0.050 0.995 3 5 0.005 1.000 The 1 th roll produces : 3 star rarity item. The 2 th roll produces : 3 star rarity item. The 3 th roll produces : 3 star rarity item. The 4 th roll produces : 3 star rarity item. The 5 th roll produces : 3 star