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Australian AMC 2024 - Intermediate Question 20

AMC AUSTRALIA · Australian AMC 2024 - Intermediate

Question 20

I make up all the 5 digit numbers that use each of the digits from 1 to 5 once. I then arrange these 120 numbers in increasing order from 12 345 to 54 321. Which number is the 42 nd in this order?
  1. 15 234
  2. 21 354
  3. 23 154
  4. 24 531
  5. 24 513