象棋比赛中,每个选手都与其他选手恰好比赛一局,每局胜者记2分,负者记0分,和棋各记1分,四位观众统计了比赛中全部选手得分总数分别是:1979,1980,1...

作者: rantiku 人气: - 评论: 0
问题 象棋比赛中,每个选手都与其他选手恰好比赛一局,每局胜者记2分,负者记0分,和棋各记1分,四位观众统计了比赛中全部选手得分总数分别是:1979,1980,1983,1985,经核实只有一位观众统计正确,则这次比赛的选手共有多少名? A. 44 B. 45 C. 46 D. 47
选项
答案 B
解析 很容易判断比赛总分不可能为奇数,则总分只可能是1980,那么由1980/2=990,所以共进行了990场比赛,设参赛选手为X,(x-1)+(x-2)+...+2+1=990,解得X=45,故答案为B。
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