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angka di ratusan = (2, 3, 4, 5) = 4 angka (anggap angka 1 sudah dipakai)
angka di puluhan = (0, 3, 4, 5) = 4 angka (anggap angka 1 dan 2 sudah dipakai)
Banyak cara = 3 * 4 * 4
= 48 cara