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JEE Main Mathematics question

MathematicsPermutations and CombinationsJEE Main

Let digit numbers be constructed using the digits with repetition allowed, and are arranged in ascending order with serial numbers. Then the serial number of the number is

Answer: 2997

Solution

Count the -digit numbers smaller than : first digit or : . First digit : second digit : ; second digit and third digit :

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Question ID VK-020902