(9) अलग-अलग वस्तुओं को पंक्ति में व्यवस्थित करना है। तीन विशेष वस्तुएं आपस में साथ रहें लेकिन उनका आंतरिक क्रम निश्चित हो। कितनी व्यवस्थाएं होंगी?
(9) distinct objects are to be arranged in a row. Three particular objects must stay together but their internal order is fixed. How many arrangements are possible?
Explanation opens after your attempt
A. (5040)
Concept
Treat the three objects as a fixed-order block, giving (7) units. Hence there are (7!=5040) arrangements.
Why this answer is correct
The correct answer is A. (5040). Treat the three objects as a fixed-order block, giving (7) units. Hence there are (7!=5040) arrangements.
Exam Tip
तीन वस्तुओं को fixed-order ब्लॉक मानें, तब (7) इकाइयां बनती हैं। इसलिए (7!=5040) व्यवस्थाएं होंगी।
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