There are 51 bikes in a showroom which are ready to sell with numbers from \(1\) to 51 marked on each of them. Then answer the following questions.
Questions:
(I) What is the probability of 9 bikes getting sold?
The probability of 9 bikes getting sold \(=\)
(II) What is the probability of 16 bikes getting sold?
The probability of 16 bikes getting sold \(=\)
[Note: Submit all the answers in fraction without solving].