1.

There are 10 balls in a box, 5 white and 5 black. Two balls are removed randomly from the box, one after another. The first ball that is removed is black and it is not returned to the box. What is the probability that the second ball that is removed is also black?1. 5 / 92. 4 / 93. 3 / 94. 1 / 2

Answer»

Correct option is 2. 4 / 9 

10 balls → 5B and 5W 

After removing 1 B balls, total balls left = 9 and 

Total black balls left = 4

∴ P (B ball after removing 1st B ball) = 4 / 9



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