(7) पुस्तकों को एक शेल्फ पर इस प्रकार कितने तरीकों से रखा जा सकता है कि दो विशेष पुस्तकें दोनों सिरों पर रहें?
In how many ways can (7) books be arranged on a shelf so that two particular books occupy the two ends?
Explanation opens after your attempt
A. (240)
Concept
The two particular books can occupy the ends in (2!) ways and the remaining books in (5!) ways. The total is \(2!\cdot5!=240\).
Why this answer is correct
The correct answer is A. (240). The two particular books can occupy the ends in (2!) ways and the remaining books in (5!) ways. The total is \(2!\cdot5!=240\).
Exam Tip
दो विशेष पुस्तकें सिरों पर (2!) तरीकों से और शेष (5!) तरीकों से रखी जाएंगी। कुल \(2!\cdot5!=240\) है।
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