How many three digit numbers abc are formed where at least two of the three…
2023
How many three digit numbers abc are formed where at least two of the three digits are same.
- A.
252
- B.
291
- C.
170
- D.
311
Attempted by 14 students.
Show answer & explanation
Correct answer: A
Sol:
Total 3 digit numbers = 9 x 10 x 10 = 900
Total number of 3 digit numbers without repetition = 9 x 9 x 8 = 648
So number of three digit numbers with at least one digit repeats = 900 - 648=252