csatmedium
How many numbers are there between 99 and 1000 such that the digit 8 occupies the units place?
- A.64
- B.80
- C.90
- D.104
▶ Answer & Explanation
Correct answer: C. 90
We are looking for numbers strictly between 99 and 1000. These are 3-digit numbers. The units digit must be 8. For the tens digit, any digit from 0 to 9 can be used (10 options). For the hundreds digit, any digit from 1 to 9 can be used (9 options). Thus, there are 9 (hundreds) * 10 (tens) * 1 (units) = 90 such numbers.
Source: UPSC csat 2017