A . (F/P,i,n)=(F/P,i,n1)+(F/P,i,n2)B . (F/P,i,n)=(F/P,i,n1)×(F/P,i,n2)C . (P/F,i,n)=(P/F,i,n1)+(P/F,i,n2)D . (P/F,i,n)=(P/F,i,n1)×(F/P,i,n2)
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