【单选题】
小王后还剩52张牌中一张一张有放回地取4张,则恰有3张是黑桃的概率为()
①
<imgwidth="48"height="48"v:shapes="_x0000_i1087"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image122.png">
②
<imgwidth="84"height="49"v:shapes="_x0000_i1088"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image124.png">
③
<imgwidth="64"height="48"v:shapes="_x0000_i1089"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image126.png">
④
<imgwidth="61"height="48"v:shapes="_x0000_i1090"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image128.png">
【单选题】
有100张卡片(从1号到100号),从中任取一张,取到的卡号是7的倍数的概率为( )
①
<img class="kfformula" src="20190809/1565330760695228.png" data-latex="\frac {7} {50}" width="75" height="53"/>
②
<img class="kfformula" src="20190809/1565330760810107.png" data-latex="\frac {3} {20}" width="68" height="53"/>
③
<img class="kfformula" src="20190809/1565330760716247.png" data-latex="\frac {7} {100}" width="76" height="53"/>
④
<img class="kfformula" src="20190809/1565330760831846.png" data-latex="\frac {7} {48}" width="68" height="53"/>