(8) अलग-अलग सिक्कों को पंक्ति में रखा जाए। दो विशेष सिक्के दोनों सिरों पर न हों, तो व्यवस्थाएं कितनी होंगी?
(8) distinct coins are arranged in a row. If two particular coins should not occupy the two ends, how many arrangements are possible?
Explanation opens after your attempt
A. (38880)
Concept
Subtract the cases where the two particular coins occupy the two ends, which are \(2!\cdot6!\), from total (8!). The answer is (40320-1440=38880).
Why this answer is correct
The correct answer is A. (38880). Subtract the cases where the two particular coins occupy the two ends, which are \(2!\cdot6!\), from total (8!). The answer is (40320-1440=38880).
Exam Tip
कुल (8!) में से दोनों विशेष सिक्कों के सिरों पर आने वाली \(2!\cdot6!\) व्यवस्थाएं घटाएं। उत्तर (40320-1440=38880) है।
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