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

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

JEE MainJEE Main 2022Permutations and Combinations

Solution:

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 $=243$