A bag contains 5 red and 7 white balls Four balls are drawn out one by one and not replaced What is ...........

Quantitative Aptitude ( CCS) Probability

A bag contains 5 red and 7 white balls. Four balls are drawn out one by one and not replaced. What is the probability that they are alternatively of different colours?

7/99

11/99

14/99

19/99

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Explanation:

Answer & Explanation
Answer – 14/99
Explanation :
Balls are picked in two manners – RWRW or WRWR
So probability = (5/12)*(7/11)*(4/10)*(6/9) + (7/12)*(5/11)*(6/10)*(4/9) = 14/99