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MHT CET Mathematics question

MathematicsPermutations and CombinationsMHT CET

The number of positive integers which can be formed by using any number of digits from but using each digit not more than once in each number, is

Answer: (D)

Solution

Count by number of digits, with the leading digit non-zero: -digit ; -digit ; -digit . -digit

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Question ID VK-027790