(7) अलग-अलग छात्रों को एक पंक्ति में बैठाना है। दो विशेष छात्र साथ हों और तीसरा विशेष छात्र किसी सिरे पर न हो, तो कितनी व्यवस्थाएं होंगी?
(7) distinct students are to be seated in a row. If two particular students sit together and a third particular student is not at either end, how many arrangements are possible?
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Correct Answer
B. (1200)
Concept
Treat the two students as a block, count \(6!\cdot2!\) together arrangements and subtract cases where the third is at an end. The answer is (1200).
Why this answer is correct
The correct answer is B. (1200). Treat the two students as a block, count \(6!\cdot2!\) together arrangements and subtract cases where the third is at an end. The answer is (1200).
Exam Tip
दो छात्रों को ब्लॉक मानकर पहले साथ वाली \(6!\cdot2!\) व्यवस्थाएं लें और तीसरे के end cases घटाएं। उत्तर (1200) है।
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