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f(x)=x! 比如1:1 2:1*2=2 3:1*2*3=6 4:1*2*3*4=24 5:1*2*3*4*5=120 . 非要一般的式子的話可以寫成 seriesProduct(n,n,1,x) 意思是1*2*3*4*…*x seriesProduct的符號是∏
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