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  4. 2011 is an example of a 4 digit number, exactly 2 digits of which are identical and adjacent. Number of 4 digit numbers with the same property including 2011, is

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Q. 2011 is an example of a 4 digit number, exactly 2 digits of which are identical and adjacent. Number of 4 digit numbers with the same property including 2011, is

Permutations and Combinations

Solution:

Correct answer is (a) 1944

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