【单选题】
设事件A和B的概率为<img class=jc-formula data-tex=P(A)=\frac { 1 }{ 2 } ,P(B)=\frac { 2 }{ 3 } src=https://huaweicloudobs.ahjxjy.cn/B8A27CF4C2717DCB36E435476F547299.png style=vertical-align: middle;/>则P(AB)可能为
④
<img class=jc-formula data-tex=\frac { 1 }{ 6 } src=https://huaweicloudobs.ahjxjy.cn/A21CFDE4872E0D4758507486117F82D5.png style=vertical-align: middle;/>
【单选题】
打靶3 发,事件Ai表示“击中i发”,i= 0,1,2,3。那么事件<img class=jc-formula data-tex=A={ A }_{ 1 }\cup { A }_{ 2 }\cup { A }_{ 3 } src=https://huaweicloudobs.ahjxjy.cn/89D15616050B7F4278D8D6DF780248B4.png style=vertical-align: middle;/>表示
【单选题】
设<img class=jc-formula data-tex=0P(A)1,0P(B)1,P(A\left| B \right) +P(\overline { A } \left| \overline { B } \right )=1 src=https://huaweicloudobs.ahjxjy.cn/8A1B3E06E77B99186F1AA8E01E3316C3.png style=vertical-align: middle;/>,则下列结论成立的是
【单选题】
设A,B,C为三个事件,且A,B相互独立,则以下结论中不正确的是
②
若P(C)=1,则<img class=jc-formula data-tex=A\cup C src=https://huaweicloudobs.ahjxjy.cn/ECFBDDF24996917EA300075A2EF96068.png style=vertical-align: middle; width: 56px; height: 20px; width=56 height=20/>与B也独立.
③
若P(C)=0,则<img class=jc-formula data-tex=A\cup C src=https://huaweicloudobs.ahjxjy.cn/ECFBDDF24996917EA300075A2EF96068.png width=56 height=20 style=font-family: 宋体; font-size: 14px; white-space: normal; vertical-align: middle; width: 56px; height: 20px;/>与B也独立.
④
若<img class=jc-formula data-tex=C\subset B src=https://huaweicloudobs.ahjxjy.cn/5AF7C06E7D78B9242171900D637B5C9F.png style=vertical-align: middle; width: 51px; height: 23px; width=51 height=23/>,则A与C也独立
【单选题】
一口袋中有3个红球和2个白球,某人从该口袋中随机摸出一球,摸得红球得5分,摸得白球得2分,则他所得分数的数学期望为
【单选题】
设A,B为两随机事件,且A<img class=jc-formula data-tex=\supset src=https://huaweicloudobs.ahjxjy.cn/37A4B3C430EFA04CF480D02C0DFECE89.png style=vertical-align: middle; width: 20px; height: 17px; width=20 height=17/>B,则下列式子正确的是
①
P(A<img class=jc-formula data-tex=\cup src=https://huaweicloudobs.ahjxjy.cn/9BD598E68F21E65385221B2250659C3A.png style=vertical-align: middle; width: 22px; height: 14px; width=22 height=14/>B) = P(A)
②
P(AB)=P(A)<img width=99 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/>
④
P(B-A)=P(B)-P(A)<img width=76 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/><img width=83 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image004.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/><img width=76 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/><img width=83 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image004.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/><img width=76 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/><img width=83 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image004.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/><img width=76 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/><img width=83 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image004.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/><img width=76 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/><img width=83 height=21 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image004.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/>
【单选题】
设<img src=https://huaweicloudobs.ahjxjy.cn/044358115371A01359D17139122ECBCA.png title=4HLX6P8]}I`9_~4~SXU0NKO.png alt=4HLX6P8]}I`9_~4~SXU0NKO.png style=white-space: normal;/>的一个原函数,且<img src=https://huaweicloudobs.ahjxjy.cn/D2A606CDFF44F27A45F7B9B1AC8D29F9.png title=_3([30DGZ00_8XYG~VS`SK7.png alt=_3([30DGZ00_8XYG~VS`SK7.png style=white-space: normal;/>为奇函数,则<img src=https://huaweicloudobs.ahjxjy.cn/B1EF4D45BB73E79FB3629A58EB3ED0C5.png title=[4B}0%TF4S_IH(RC)J%V]M4.png alt=[4B}0%TF4S_IH(RC)J%V]M4.png style=white-space: normal;/>是( )
【单选题】
It wasn’t until nearly a month later ___ I received the manager’s reply.
【单选题】
I remember her face but I cannot___ where I met her.
【单选题】
If my lawyer ___ here last Saturday, he ___ me from going.
①
had been; would have prevented
②
had been; would prevent
④
were; would have prevented