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IMSO 2007 Mathematics - International Short Answer Question 22

IMSO Maths · IMSO 2007 Mathematics - International Short Answer

Question 22

Euis lists all four-digit natural numbers satisfying all four conditions: all digits are different; no digit is 0, 5, 7 or 9; the sum of the digits is 20; the number is divisible by 4. How many numbers are listed?