Explanation:

To find the number of ways to pay Rs 10 using denominations Rs 1, Rs 2, and Rs 5, follow these steps:

- Use coins of Rs 5:

- 0 x Rs 5: 10 coins of Rs 1; 5 coins of Rs 2 (5 ways)

- 1 x Rs 5: 5 coins of Rs 1; 3 coins of Rs 1 + 2 coins of Rs 2; 1 coin of Rs 1 + 4 coins of Rs 2 (3 ways)

- 2 x Rs 5: No additional coins needed (1 way)

- In total, there are 5 (0 x Rs 5) + 3 (1 x Rs 5) + 1 (2 x Rs 5) = 9 ways.

Option:2, 9 is correct.