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조합 구하기
조합은 순서 상관없이 n개의 숫자중에 r을 뽑는것을 말한다. 다시 말해, 1,2,3 이 주어지면 1,2 / 1,3 / 2,3 이렇게 조합을 구할 수 있다. 1,2 / 2,1은 같은거라고 본다. (순열은 다른거라고 본다.)따라서 nCr = nPr / r! 라고도 말할 수
2021년 11월 25일
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