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= 12C3
= 12!/(3! . (12-3)!)
= 12!/(3! . 9!)
= (12 . 11 . 10 . 9!)/(3 . 2 . 1 . 9!)
= (12 . 11 . 10)/(3 . 2 . 1)
= 220
= 12 .11 . 10. 9! / 9! 3. 2.1
= 220 cara