(9) अलग-अलग वस्तुओं को पंक्ति में रखते समय दो विशेष वस्तुएं दोनों सिरों पर न आएं। व्यवस्थाएं कितनी होंगी?
While arranging (9) distinct objects in a row, two particular objects should not occupy the two ends. How many arrangements are possible?
Explanation opens after your attempt
B. (342720)
Concept
Subtract the cases where both particular objects occupy the two ends, which are \(2!\cdot7!\), from total (9!). The answer is (362880-10080=352800).
Why this answer is correct
The correct answer is B. (342720). Subtract the cases where both particular objects occupy the two ends, which are \(2!\cdot7!\), from total (9!). The answer is (362880-10080=352800).
Exam Tip
कुल (9!) में से दोनों विशेष वस्तुओं के सिरों पर आने वाली \(2!\cdot7!\) व्यवस्थाएं घटाएं। उत्तर (362880-10080=352800) है।
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