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Frederik

Terang dan Gelap

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Kursi-kursi di sebuah bioskop disusun dalam baris-baris, satu baris berisi 10 buah kursi. Berapa banyak cara mendudukkan 6 orang penonton pada satu baris kursi:
(a) jika bioskop dalam keadaan terang
(b) jika bioskop dalam keadaan gelap

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