How to find the total cases where a four digit number has two like digits,three like digits, two pairs of like digits, four like digits etc...
How to calculate number of favourable cases for the following problem
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combinatorics
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3Have you no thoughts of your own on how to do this? – 2012-08-31
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2Four like digits is not hard, though the answer depends upon whether you allow 0000. – 2012-08-31