8选3,C(8,3) = 8!/3!/(8-3)! = 56种可能。
具体是:
ABC,ABD,ABE,ABF,ABG,ABH,ACD,ACE,ACF,ACG,ACH,ADE,ADF,ADG,ADH,AEF,AEG,AEH,AFG,AFH,AGH,BCD,BCE,BCF,BCG,BCH,BDE,BDF,BDG,BDH,BEF,BEG,BEH,BFG,BFH,BGH,CDE,CDF,CDG,CDH,CEF,CEG,CEH,CFG,CFH,CGH,DEF,DEG,DEH,DFG,DFH,DGH,EFG,EFH,EGH,FGH,
total = 56
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