名校
1 . 下列五个命题
①在某项测量中,测量结果
服从正态分布
,若
在(0,2)内取值的概率为0.4,则
在(0,+∞)内取值的概率为0.8;
②集合
,
,则
的真子集个数为3;
③命题“若
,则
”的逆否命题为“若
,则
”;
④若
的展开式中各项的二项式系数之和为
,则此展开式中
项的系数为
;
⑤在
道题中有
道理科题和
道文科题,如果不放回地依次抽取
道题,在第1次抽到理科题的条件下,第2次抽到理科题的概率为
.
其中正确的个数为( )
①在某项测量中,测量结果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ebc80e6cdaa4ccef8de10f6845223f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
②集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d304ab6ef3bdca676cb43c6d63e3de8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c57f7aa48188d5ab9f14bf327bb3deb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdbfa7a63fdf5717d40c8c9a73ec160.png)
③命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37b0b55c3297ce66c96d1559d76971f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb0469b312798e19c24fe494d03fb0a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727bd2eb1d561e821c4d175f15cf705e.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b12af9f76f37024f3756e644de0315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/814397354c2ae1cb08e0271305970811.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f959e5f8d89390f0f136f6acc9f6fb.png)
⑤在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
其中正确的个数为( )
A.2 | B.3 | C.4 | D.5 |
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