Elements of Combinatorial Analysis

[Dhamnekar Win,odd]

I know the answer to question 8. But how to answer question 9.

[Genady]

A probability of finding m cells empty when you have r+1 objects is comprised of a probability of finding m cells empty when you have r objects and an additional object is placed in one of the occupied cells, and a probability of finding m+1 cells empty when you have r objects and an additional object is placed in one of the empty cells.

[Dhamnekar Win,odd]

    Thanks for your reply. I am working on the question 9 and statement in your reply to prove it practically as well as theoretically.

[Dhamnekar Win,odd]

 This problem is " SOLVED"