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A bag contains 8 white and 6 black balls...

A bag contains 8 white and 6 black balls. A ball is drawn at random from the bag, its colour is observed and is kept aside (i.e. not returned in the bag). Three additional balls of the same colour as observed are put in the bag. If now two balls are drawn simultaneously at random from the bag, then the probability that these are of different colours, is ____

A

`2//5`

B

`4//15`

C

`7//25`

D

`18//35`

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The correct Answer is:
D
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