2023 · Q35
If there are enough coins of denomination Rs.1, Rs.2 and Rs.5, then in how many ways can one pay Rs.10?
General Mental Ability, Quantitative Aptitude and StatisticsNumber system and arithmetic
- A8
- B9
- C10
- D11
Explanation
Count by the number of Rs. 5 coins used. With 0 fives, the Rs. 2 coins can number 0 to 5, giving 6 ways. With 1 five, the Rs. 2 coins can number 0 to 2, giving 3 ways. With 2 fives, there is exactly 1 way. The total is 6 + 3 + 1 = 10 ways, option (c).