Write a 9-digit number where exchanging any two digits results in - Mix Questions (Page 20 & 21)

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Question 3 Write a 9-digit number where exchanging any two digits results in a bigger number. How many such numbers exist?A number that increases when any two digits are exchanged must have digits in strictly increasing order One such 9-digit number is 123456789 For any other number, we would not have a bigger number after exchanging

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