A bag contains 12 white and 18 black balls. Two balls are drawn in succession without replacement. What is the probability that first is white and second is black?  Choices.
A) 20/145  B) 18/145  C) 35/120  D) 36/145  E) 40/145
The probability that first ball is white:   =12C1/30C1   12/30   =&gt;2/5   Since, the ball is not replaced; =&gt; the number of balls left in bag- 29.   the probability the second ball - BLACK   18C1/29C1 = 18/29   req = 2/5 * 18/29 = 36/145   ANSWER 36/145
<result>D</result>
A bag contains 12 white and 18 black balls. Two balls are drawn in succession without replacement. What is the probability that first is white and second is black?