Question 1053378
12 balls: 5 white, and 7 black balls
P(?, ? , B,B,B , W) =
P(W, W , B,B,B , W) +
P(B, B , B,B,B , W) +
P(B, W , B,B,B , W) +
P(W, B , B,B,B , W)
P = (5/12)(4/11)(7/10)(6/9)(6/8)(3/7) + (7/12)(6/11)(5/10)(4/9)(3/8)(5/7)
+ (7/12)(5/11)(6/10)(5/9)(4/8)(4/7) +  (5/12)(7/11)(6/10)(5/9)(4/8)(4/7)
P ={{{ (1/(12*11*10*9*8*7))(5*4*7*6*6*3 + 7*6*5*4*3*5 + 7*5*6*5*4*4 + 5*7*6*5*4*4)}}}