寻双色球中二等奖,三等奖的概率计算方法?
计算中二等奖和三等奖概率的方法
推荐回答(5个)
以下几位算的都不对,正确应该是:
一等奖:(6+1) 33个中选中6个,概率为C(33,6)=1107568分之1,再选中一个蓝球概率为16分之1,那么一等奖概率为1107568分之1乘以16分之1=17721088分之1,就是一千七百七十几万分之1的概率中一等奖
二等奖:(6+0)红球选中6个,概率为C(33,6)=1107568分之1,再选不中一个篮球的概率为16分之15,那么二等奖概率为1038345分之1
三等奖:(5+1)红球选中5个,概率为C(33,5)剩一个红球在28个中选一个,但是不能选中,选中了就是6+0了,所以在28个中选27个不中的球,概率为28分之27,那么5+0的概率为C(33,5)乘以28分之27再乘以6分之1=38143分之1,(注意这里的6分之1是因为你用两块钱买一注6+1的双色球,可以分为6注5+1,意思是6个红球可以组成6组5个红球的组合,等于你买了一注6+1相当于5+1可以组6注,跟你买复式一样的道理,比如你买一注7+1,那么就等于买了7注6+1一样的道理)再选中一个蓝球的概率为16分之1,那么三等奖的概率为38143分之1乘以16分之1=610292分之1即六十一万分之一的概率中三等奖
四等奖:(5+0或者4+1)同上5+0概率为38143分之1,再蓝球选不中的概率为16分之15,那么四等奖概率为35759分之1 ,或者4+1概率为,33个中选中4个C(33,4)=40920分之1在剩下的29个中选不中两个的概率为29分之27,同上你买一注双色球6个红球可以组成15组4+0红球,再选中一个红球的概率为16分之一,那么三等奖的概率为C(33,4)乘以29分之27乘以15分之1乘以16=40637分之1即四万零六百分之1
五等奖:(3+1或者4+0)算法同上,概率算出为:2539分之1或者3928分之1
六等奖:(1+1或者2+1)反正中一个蓝球就有,那么六等奖概率为16分之1
楼上二等奖计算的不对。
二等奖是 【1/(33选6)】乘以(16分之15)
三等奖是 【1/(33选5)】乘以【28选1】乘以(16分之1)
33选6=1107568
33选5=237336
28选1=28
所以,二等奖是 【1/(33选6)】乘以(16分之15)
=【1/1107568】*(15/16)
=15/17721088 约等于 1/1181406
也就是中二等奖的概率是中一等奖的15倍。
三等奖是 【1/(33选5)】乘以【28选1】乘以(16分之1)
=【1/237336】*28*(1/16)
=28/3797376
=7/949344 约等于 1/135621
二楼的三等奖算的绝对不对。
至于一楼,只是二等奖忽略了包含一等奖的情况这一点点小瑕疵。
三等奖还是一楼计算的正确的
首先,必须猜中六个号码中的5个号码
就是 C(6,5),其次,在剩余的28个号码中选一个(其实只有27个,如果还有一个选对了 ,就成一等奖了) C(27,1)
所以概率是
C(6,5)*C(27,1)/ 总和,正如一楼说的
二楼的三等奖在瞎算,C(33,5),33个里面任意选5个,这是个一点意义都没有的东西。
st the essence of social anda typical woman of that time,
一等奖:7个号码相符(6个红色球号码和1个蓝色球号码)(红色球号码顺序不限,下同);
二等奖:6个红色球号码相符;
三等奖:5个红色球号码和1个蓝色球号码相符;
四等奖:5个红色球号码或4个红色球号码和1个蓝色球号码相符;
五等奖:4个红色球号码或3个红色球号码和1个蓝色球号码相符;
六等奖:1个蓝色球号码相符(有无红色球号码相符均可)。
双色球中头奖的概率:
C33(6)*16=(33*32*31*30*29*28)/(6*5*4*3*2)*16=17721088
双色球中头奖的概率为1/17721088
双色球二等奖的概率为:
1/C33(6)=1/((33*32*31*30*29*28)/(6*5*4*3*2)=1/1107568
双色球三等奖的概率为:
1/(C33(5)*16)=1/((33*32*31*30*29)*16/(5*4*3*2*1))=1/3797376(大家看出问题没有?怪事,比2等奖还低!)
双色球四等奖的概率为:
1/C33(5)=1/((33*32*31*30*29)/(5*4*3*2*1)=1/237336
1/(C33(4)*16)=1/((33*32*31*30)/(4*3*2*1)*16)=1/654720
双色球五等奖的概率为:
1/C33(4)=1/(33*32*31*30)/(4*3*2*1)=1/40920
1/(C33(3)*16)=1/((33*32*31)/(3*2)*16)=1/87296
双色球六奖概率:1/16=0.0625=6.25%
上述是我抄来的,除了3等奖概率算错了,其他都对的。
三等奖的应该为:
p = (C(6,5) * C(27,1))/(C(33,6)*16)
= 162/17721088
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