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7 . 宋代著名类书《太平御览》记载:“伏羲坐于方坛之上,听八风之气,乃画八卦.”乾为天,坤为地,震为雷,坎为水,良为山,巽为风,离为火,兑为泽,象征八种自然现象,以类万物之情.如图所示为太极八卦图,八卦分据八方,中绘太极,古代常用此图作为除凶避灾的吉祥图案.八卦中的每一卦均由纵向排列的三个爻组成,其中“”为阳爻,“
”为阴爻.现从八卦中任取两卦,已知取出的两卦中有一卦恰有一个阳爻,则另一卦至少有两个阳爻的概率为( )
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纵式 | 〇 | |||||||||
横式 |
排列数字时,个位采用纵式,十位采用横式,百位采用纵式,千位采用横式纵式和横式依次交替出现.如“
”表示
,“
〇
”表示
. 在“〇”、“
”、“
” 、“
”、“
”按照一定顺序排列成的三位数中任取一个,取到奇数的概率是( )
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10 . 2025年我省将实行的高考模式,其中,“3”为语文、数学,外语3门参加全国统一考试,选择性考试科目为政治、历史、地理、物理、化学,生物6门,由考生根据报考高校以及专业要求,结合自身实际,首先在物理,历史中2选1,再从政治、地理、化学、生物中4选2,形成自己的高考选考组合.
(1)若某学生根据方案进行随机选科,求该生恰好选到“历政地”组合的概率;
(2)由于物理和历史两科必须选择
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选择物理 | 选择历史 | 合计 | |
男生 | 10 | ||
女生 | 30 | ||
合计 | 30 |
附:.
0.10 | 0.05 | 0.025 | 0.01 | 0.005 | |
2.706 | 3.841 | 5.024 | 6.635 | 7.879 |