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JEE Main Mathematics question

MathematicsPermutations and CombinationsJEE Main

Five digit numbers are formed using the digits with repetitions and are written in descending order with serial numbers. For example, the number has serial number . Then the serial number of is

Answer: 1436

Solution

Count the numbers larger than : first digit or : . First digit : second digit : ; second digit with third digit or : ;

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Question ID VK-020906