Correct Answer: if the data in statement I alone is sufficient to answer the question, while the data in statement II alone are not sufficient to answer the question.
Explanation:
From I: n Suresh = 12th from left
Mohan = 17th from right = (50 - 17 + 1 = ) 34th from left
No student between them = 34 - 12 - 1 = 21
From II: No data about Mohan.
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