Question

The total number of three-digit numbers, with one digit repeated exactly two times, is

Answer 1

Answer: 243

If $0$ taken twice then ways $=9$
If $0$ taken once then ${}^9{C}_1\times 2=18$
If $0$ not taken then ${}^9{C}_1{}^8{C}_1\cdot 3=216$
Total $=243$