UP Police SI Exam 13 Dec 2017 Shift 2 Solved Paper

The following question consists of two statements 1 and 2. You have to decide whether the information given in the statements is sufficient to answer the question. Read both the statements and give the answer.
How many students are there in the row?
1. Arvind is seventh from the left end and Prabhu is fifth from the right end.
2. Arvind is seventeenth from the left end after he exchanges his position with Prabhu.