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matematika = 3 buku = 3p1
kimia = 3 buku = 3p1
fisika = 2 buku = 2! (karna selalu dipinggir)
jadi banyak cara = 2! × 3p1 × 3p1
banyak cara = 2 × 3! × 3!
banyak cara = 2 × 6 × 6
banyak cara = 72 cara
#maaf jika salah