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Difficulty: 4/102023 IOQM 2023 (Q7)

Unconventional dice are to be designed such that the six faces are marked with numbers from 1 to 6 with 1 and 2 appearing on opposite faces. Further, each face is colored either red or yellow with opposite faces always of the same color. Two dice are considered to have the same design if one of them can be rotated to obtain dice that has the same numbers and colors on the corresponding faces as the other one. Find the number of distinct dice that can be designed

Guide / Hint

Hint 1: Start by analyzing the initial conditions and setting up the basic equations. Fix 1 and 2 anywhere in 1 way.

Hint 2: Look for algebraic properties, symmetry, or geometric theorems to simplify. Fix 3 anywhere in 1 way.

Hint 3: Proceed with the final algebraic steps to solve the system. 1 2.

Solution

Step 1: Fix 1 and 2 anywhere in 1 way

Step 2: Fix 3 anywhere in 1 way

Step 3: 1 2

Step 4: Now remaining 3 faces can be filled in ways and coloring them in 2 × 2 × 2 ways

Step 5: => Total distinct dice = × 8 = 24 ways

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    2023 IOQM 2023 Q7 - Olympiad Math Olympiad Question | Leminno