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(8) books are to be arranged on a shelf. How many arrangements are possible if two particular books occupy the two ends?(8) पुस्तकों को शेल्फ पर रखना है। दो विशेष पुस्तकें दोनों सिरों पर हों तो व्यवस्थाएं कितनी होंगी?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (1440)(1440)
The two particular books occupy the ends in (2!) ways and the remaining books in (6!) ways. The total is (2!\cdot6!=1440).दो विशेष पुस्तकें सिरों पर (2!) तरीकों से और शेष (6!) तरीकों से रखी जाएंगी। कुल (2!\cdot6!=1440) है।
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