In Mock test 1, how question number 87 is different from question number 97. I think both are same question with different answers.

Hi,
The questions might seem to be similar at first glance but if you read carefully, they are different. In question 87, each person must have only one prize so required was are 8c3. In question 97, a person can have more than one prize but A's all prizes should be better than B's and B's should be better than C's. For example, A can have 1st 2nd and 3rd prizes, B can have 4th 5th and 6th prizes and C can have 7th and 8th. It is not mandatory for everyone to have one prize only, but in 87 it is mandatory.
Hope that clears your doubt.