(4) अलग-अलग मोबाइल और (3) अलग-अलग किताबों को पंक्ति में ऐसे रखा जाए कि सभी मोबाइल साथ रहें। कितनी व्यवस्थाएं होंगी?
In how many ways can (4) distinct mobiles and (3) distinct books be arranged in a row so that all mobiles stay together?
Explanation opens after your attempt
A. (576)
Concept
Treat the four mobiles as one block, then there are (4) units. The arrangement is \(4!\cdot4!=576\).
Why this answer is correct
The correct answer is A. (576). Treat the four mobiles as one block, then there are (4) units. The arrangement is \(4!\cdot4!=576\).
Exam Tip
चार मोबाइल को एक ब्लॉक मानें, तब (4) इकाइयां हैं। व्यवस्था \(4!\cdot4!=576\) होगी।
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