Question

What is the probability of getting two white balls from a box containing only white and blue balls? Statement I : There are total 72 balls in the box. Statement II : The probability of the first ball being white is 1/12.

Q: Answer-What is the probability of getting two white balls from a box containing only white and blue balls?...

From statement II Probability of second ball being white cannot be known. If we use both statements Since total 72 balls are there and probability of first being white is 112, it can happen only when there are 12 white balls in the box to make the first probability as 1272 16. So we can know that probability of second ball being white is 15. And then the probability can be found.