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In how many ways can (7) books be arranged on a shelf so that two particular books occupy the two ends?(7) पुस्तकों को एक शेल्फ पर इस प्रकार कितने तरीकों से रखा जा सकता है कि दो विशेष पुस्तकें दोनों सिरों पर रहें?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (240)(240)
The two particular books can occupy the ends in (2!) ways and the remaining books in (5!) ways. The total is (2!\cdot5!=240).दो विशेष पुस्तकें सिरों पर (2!) तरीकों से और शेष (5!) तरीकों से रखी जाएंगी। कुल (2!\cdot5!=240) है।
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