(5) अलग-अलग गणित की और (4) अलग-अलग भौतिकी की पुस्तकों को ऐसे कितने तरीकों से रखें कि हर विषय की पुस्तकें साथ रहें?
In how many ways can (5) distinct mathematics books and (4) distinct physics books be arranged so that books of each subject remain together?
Explanation opens after your attempt
B. (34560)
Concept
Treat the two subjects as two blocks, so the arrangement is \(2!\cdot5!\cdot4!=5760\). In exams, arrange both the blocks and the items inside blocks.
Why this answer is correct
The correct answer is B. (34560). Treat the two subjects as two blocks, so the arrangement is \(2!\cdot5!\cdot4!=5760\). In exams, arrange both the blocks and the items inside blocks.
Exam Tip
दो विषयों को दो ब्लॉक मानें, इसलिए व्यवस्था \(2!\cdot5!\cdot4!=5760\) है। परीक्षा में ब्लॉक और ब्लॉक के अंदर दोनों की व्यवस्था करें।
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