Banyak garis = 9 C3 = 9.! / (9-3)! .3!
= 9 ! / 6 ! . 3!
= 9.8.7 / 3 2
= 84
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Banyak garis = 9 C3 = 9.! / (9-3)! .3!
= 9 ! / 6 ! . 3!
= 9.8.7 / 3 2
= 84