Correct option (c)
Explanation:
The total number of ways of distributing n balls into m boxes is mn which are assumed to be equally likely.
Since r balls which should go to the specified box can be chosen in nCr ways and for any such way the remaining (n – r) balls can be distributed to the
![](https://www.sarthaks.com/?qa=blob&qa_blobid=5224943619389885889)
[where A is the event that a specified box will contain r balls]