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Each question is followed by two statements, I and II. Answer each question using the following instructions.

• Choose $1$ if the question can be answered by using one of the statements alone, but cannot be answered using the other statement alone.
• Choose $2$ if the question can be answered by using either statement alone.
• Choose $3$ if the question can be answered by using both statements together, but cannot be answered using either statement alone.
• Choose $4$ if the question cannot be answered even by using both statements together.

Triangle PQR has angle PRQ equal to 90 degrees. What is the value of PR + RQ?

1. Diameter of the inscribed circle of the triangle PQR is equal to $10$ cm.
2. Diameter of the circumscribed circle of the triangle PQR is equal to $18$ cm
1. $1$
2. $2$
3. $3$
4. $4$

1