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Points to be noted :
- ranapratapchandra June 25, 20181. Bucket has no order
2. Only one type of ball is present.
This means , the question can be re-phrased as 'How many ways n bins can be re-arranged for 1 type of ball ?' . The number of ball in this question can be ignored as all balls are same.
This is a pure mathematical question - no coding required. It is asking the value of nC1 which is n.
The answer will always be = number of bins = n.