+0  
 
0
68
1
avatar+4690 

Help 12

 Dec 12, 2018
 #1
avatar+679 
0

Prob of senior boy: 9/36 --> 1/4

 

Prpob of senior girl 7/35 --> 1/5

 

1/5 * 1/4 = 1/20 (D)

 Dec 12, 2018

35 Online Users

avatar
avatar
avatar
avatar
avatar