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There are $1000$ balls in a bag, of which $900$ are black and $100$ are white. I randomly draw $100$ balls from the bag. What is the probability that the $101$st ball will be black?

  1. $9/10$
  2. More than $9/10$ but less than $1$.
  3. Less than $9/10$ but more than $0$.
  4. $0$
  5. $1$
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Among 1000 balls 900 black balls can be choosen in 9/10 ways

so, Ans will be A
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