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= C10,2 / C18,2
= 10! / 2! (10-2)! / 18! / 2! (18-2)!
= 10x9x8! / 2x1x8! / 18x17x16! / 2x1x16!
= 10x9 / 2x1 / 18x17/ 2x1
= 90/2 / 306/2
= 45 / 153 ----> sama-sama bagi 9
= 5 / 17
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