A bag contains 6 white balls and 9 black balls. Four balls are drawn at random. Find the probability for the first draw to give 4 white and the second draw to give 4 black balls in each of the following cases ​:
(a) balls are replaced before the second draw 
(b) the balls are not replaced before the second draw 

Dear Student,
Please find below the solution to the asked query:

4 W+9B=15 ballsi balls are replaced before the second draw Required Probabilty= 6C4 15C4×  9C4 15C4i balls are not replaced before the second draw Required Probabilty= 6C4 15C4×  9C4 11C4 11 because 4 balls are drawn

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