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http://haskell.g.hatena.ne.jp/nobsun/20060606/p1
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c _ 0=1 c n r=div((n-r+1)*c n(r-1))r
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c n r=div(product[n-r+1..n])$product[1..r]
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http://d.hatena.ne.jp/shinichiro_h/20051109#1131485281
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