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HKIMO 2019 Grade 8 National Final (Heat) Set 02 Question 23

HKIMO · HKIMO 2019 Grade 8 National Final (Heat) Set 02

Question 23

Use digits 0, 1, 2, 5, 7, 8 without repetition to form five-digit numbers. No two odd digits may be adjacent. How many numbers are possible?