(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
Correct Answer

A. (5760)

Step 1

Concept

Treat the two subjects as two blocks, so \(2!\cdot5!\cdot4!=5760\). In exams, also multiply internal arrangements in the block method.

Step 2

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.

Step 3

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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Mathematics Answer, Explanation and Revision Hints

(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?

Correct Answer: A. (5760). Explanation: दो विषयों को दो ब्लॉक मानें, इसलिए \(2!\cdot5!\cdot4!=5760\)। परीक्षा में block method में अंदरूनी व्यवस्था भी गुणा करें। / Treat the two subjects as two blocks, so \(2!\cdot5!\cdot4!=5760\). In exams, also multiply internal arrangements in the block method.

Which concept should I revise for this Mathematics MCQ?

Treat the two subjects as two blocks, so \(2!\cdot5!\cdot4!=5760\). In exams, also multiply internal arrangements in the block method.

What exam hint can help solve this Mathematics question?

दो विषयों को दो ब्लॉक मानें, इसलिए \(2!\cdot5!\cdot4!=5760\)। परीक्षा में block method में अंदरूनी व्यवस्था भी गुणा करें।