Find It Out !!!

A bag contains 7 black balls and an unknown number, not greater than seven, of white balls. The number of white balls range from 0 to 7, with equal probability.

Now, four balls are drawn successively without replacement and are all found to be white. What is the chance that a black ball will be drawn next ?

How To Answer

  • Answer as \(p+q\) if your answer comes out to be of the form \(\frac{p}{q}\), where \(gcd(p,q) = 1\).


  • This problem is a part of the set 1+2=3

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