Free GMAT Practice Question

Question 1 of 1
ID: GMAT-QR-PS-053
Section: Quantitative Reasoning - Problem Solving (PS)
Topic: Combinatorics
Difficulty level: Hard

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A community centre issues each member a four-digit reference number. Every digit is chosen from $1,2,3,4,5,6$; no two digits that sit next to each other may be equal; and at least one of the four digits must be $5$. How many different reference numbers meet all three conditions?

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