(5) अलग-अलग रसायन विज्ञान और (4) अलग-अलग जीव विज्ञान की पुस्तकों को ऐसे कितने तरीकों से रखें कि विषयवार पुस्तकें साथ रहें?
In how many ways can (5) distinct chemistry books and (4) distinct biology books be arranged so that books of each subject remain together?
Explanation opens after your attempt
A. (5760)
Concept
Treat the two subjects as two blocks, so \(2!\cdot5!\cdot4!=5760\). In exams, also multiply internal arrangements in the block method.
Why this answer is correct
The correct answer is A. (5760). Treat the two subjects as two blocks, so \(2!\cdot5!\cdot4!=5760\). In exams, also multiply internal arrangements in the block method.
Exam Tip
दो विषयों को दो ब्लॉक मानें, इसलिए \(2!\cdot5!\cdot4!=5760\)। परीक्षा में block method में अंदरूनी व्यवस्था भी गुणा करें।
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