A.隊數(shù) B.隊數(shù)+1 C.隊數(shù)-1 D.隊數(shù)×(隊數(shù)-1)÷2
A.隊數(shù) B.隊數(shù)+1 C.隊數(shù)-1 D.隊數(shù)×(隊數(shù)-1)÷2