1,2,3,4,5,6个数字中,两数之和等于9的概率是多少 在两个袋内,分别装着写有0,1,2,3,4,5,六个数字的6...
\u5728\u4e24\u4e2a\u888b\u5185\uff0c\u5206\u522b\u5199\u7740\u88c5\u67091\uff0c2\uff0c3\uff0c4\uff0c5\uff0c6\u516d\u4e2a\u6570\u5b57\u76846\u5f20\u5361\u7247\uff0c\u4eca\u4ece\u6bcf\u4e2a\u888b\u4e2d\u5404\u53d6\u4e00\u5f20\u5361\u7247\uff0c\u5219\u4e24\u6570\u4e4b\u548c\u7b49\u4ece\u4e24\u4e2a\u888b\u4e2d\u5404\u53d6\u4e00\u5f20\u5361\u7247\uff0c\u6bcf\u4e2a\u888b\u4e2d\u67096\u5f20\u5361\u7247\uff0c\u5373\u67096\u79cd\u53d6\u6cd5\uff0c\u52192\u5f20\u5361\u7247\u7684\u53d6\u6cd5\u67096\u00d76=36\u79cd\uff0c\u5176\u4e2d\u548c\u4e3a9\u7684\u60c5\u51b5\u6709\uff083\uff0c6\uff09\uff0c\uff086\uff0c3\uff09\uff0c\uff084\uff0c5\uff09\uff0c\uff085\uff0c4\uff09\uff0c\u51714\u79cd\u60c5\u51b5\uff0c\u5219\u4e24\u6570\u4e4b\u548c\u7b49\u4e8e9\u7684\u6982\u7387\u4e3a436=19\uff0c\u6545\u9009C\uff0e
\u4ece\u6bcf\u4e2a\u888b\u5b50\u4e2d\u4e2a\u62bd\u53d6\u4e00\u4e2a\uff0c\u5176\u4e2d\u67091+5\uff0c2+4,3+3\u8fd9\u4e09\u79cd\u60c5\u51b5\uff0c\u4f46\u662f\u7531\u4e8e\u4e24\u4e2a\u888b\u5b50\u4e0d\u53ef\u80fd\u76f8\u540c\uff0c\u6240\u4ee5\u6709\u56db\u79cd\u60c5\u51b5\u3002\u5176\u4e2d\u62bd\u51fa1\u7684\u6982\u7387\u4e3a1/6,\u62bd\u51fa5 \u7684\u6982\u7387\u4e3a1/6\u3002\u6240\u4ee5\u4e3a1/36.\u518d\u4e58\u4ee54\u4e3a1/9\u3002\u800c\u4e143+3\u7684\u60c5\u51b5\u53ea\u7b97\u4e00\u79cd\uff0c\u6545\u518d\u52a01/36\u3002\u4e00\u5171\u4e3a5/36\u3002\u3002\u6c42\u91c7\u7eb3\u3002
所有可能的结果有(1,2)(1,3)(1,4)(1,5)(1,6)(2,3)(2,4)(2,5)(2,6)(3,4)(3,5)(3,6)(4,5)(4,6)(5,6)共15种,其中满足和为9的情况有(3,6)(4,5)两种,所以概率为2/1513.3%
这六个数字一共有6*5/2=15种组合方式,其中有两种: 3+6 4+5的和是9
概率就是 2/15=0.133333333...
总共有6x5种求和,和为9的有4种,然后就是2/15
百分之二十
12 13 14 15 16 21 22 23 24 25 26 31 32 33 34 35 36 41 42 43 44 45 46 51 52 53 54 55 56 61 62 63 64 65 66
25个中有10个,也就是5分2
0.4%
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