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Option 3 : Statements 1 and 2 together are sufficient.

Statement 1: There are 25 students in a class.

No information is given about Nitya. So, statement 1 is not sufficient.

Statement 2: There are 15 students who have scored less than Nitya

No information is given about the total number of students. So, statement 2 is not sufficient.

Combining statements 1 and 2:

There are 25 students in a class. There are 15 students who have scored less than Nitya.

Here, Nitya scored 10th rank.

Hence, statement 1 and 2 together are sufficient.

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