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While arranging (9) distinct objects in a row, two particular objects should not occupy the two ends. How many arrangements are possible?(9) अलग-अलग वस्तुओं को पंक्ति में रखते समय दो विशेष वस्तुएं दोनों सिरों पर न आएं। व्यवस्थाएं कितनी होंगी?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (342720)(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).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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