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JEE Main Mathematics question

MathematicsPermutations and CombinationsJEE Main

An -digit number is a positive number with exactly digits. Nine hundred distinct -digit numbers are to be formed using only the three digits and . The smallest value of for which this is possible, is

Answer: (B)

Solution

With only the digits (no leading-zero issue), the number of -digit numbers is

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Question ID VK-020598