Question 3 - Mix Questions (Page 20 & 21) - Chapter 1 Class 7 - Large Numbers Around us (Ganita Prakash)

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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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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 15 years. He provides courses for Maths, Science and Computer Science at Teachoo