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Home » Number of favorable outcomes (include 2 and two odd primes): - Dachbleche24

Number of favorable outcomes (include 2 and two odd primes): - Dachbleche24

📅 March 10, 2026 👤 scraface

Mar 10, 2026

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📌 Favorable outcomes: $6 \cdot 20 = 120$.

📌 Probability: $rac{120}{252} = rac{10}{21}$.

📌 Thus, the probability is $oxed{\dfrac{10}{21}}$.

📌 Question: A museum has 7 digital kiosks arranged in a circle for interactive displays. In how many distinct ways can 4 curator-led sessions (each hosted by a different kiosk) be assigned to 4 kiosks, if rotations of the arrangement are considered identical?

📌 Solution: Since the kiosks are arranged in a circle and rotations are considered the same, we fix one session to eliminate rotational symmetry. First, assign 4 out of 7 kiosks to the sessions: $inom{7}{4} \cdot 4!$ would count linear arrangements. But due to circular symmetry, we divide by 4 (the number of rotations).

📌 Alternatively, fix one session at a position to break rotational symmetry. Then choose 3 remaining kiosks from the remaining 6 and assign the other 3 sessions:

📌 Number of ways: $inom{6}{3} \cdot 3! = 20 \cdot 6 = 120$.

📌 Hence, the number of distinct circular arrangements is $oxed{120}$.

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