(7) लड़कियों और (3) लड़कों को एक पंक्ति में ऐसे कितने तरीकों से बैठाया जाए कि तीनों लड़के साथ बैठें?
In how many ways can (7) girls and (3) boys be seated in a row so that all three boys sit together?
Explanation opens after your attempt
C. (241920)
Concept
Treat the three boys as one block, then there are (8) units. The arrangement is \(8!\cdot3!=241920\).
Why this answer is correct
The correct answer is C. (241920). Treat the three boys as one block, then there are (8) units. The arrangement is \(8!\cdot3!=241920\).
Exam Tip
तीनों लड़कों को एक ब्लॉक मानें, तब कुल (8) इकाइयां हैं। व्यवस्था \(8!\cdot3!=241920\) होगी।
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