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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.

How many people are watching TV programme P?

1. Number of people watching TV programme Q is $1000$ and number of people watching both the programmes, P and Q, is $100.$
2. Number of people watching either P or Q or both is $1500.$
1. $1$
2. $2$
3. $3$
4. $4$

1