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" If "C(2n,3):C(n,2)=12:1" ,then "n=...

" If "C(2n,3):C(n,2)=12:1" ,then "n=

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If C(20,3):C(n,2)=12:1, then n=

If C (2n,3) : C ( n,2)=12 : 1 find n,

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