A bag contains white, and black balls and four balls are sucessively drawn out and not replaced. The probability that they are alternately of different colours, is
Explanation for correct option:
Calculate the probability :
There are two cases :
Case : When first ball is white, second is black, third is white and fourth is black. (WBWB)
Case : When first ball is black, second is white, third is black and fourth is white. (BWBW)
And bag contains white, and black balls
In case the probability of getting alternate colours (without replacement )
In case the probability of getting alternate colours (without replacement )
Therefore, the required probability
Hence the correct option is (C).