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C(n)(m)指的是排列組合 第234項係數分別是n C(2)(n)C(3)(n) 所以2C(2)(n)=n+C(3)(n) 2*n!/((n-2)!*2!)=n+n!/((n-3)!*3!) n(n-1)=n+n(n-1)(n-2)/6 所以n=0或2或7 由於分解式有第四項,所以0,2舍去 n=7
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