अक्षरों (A,B,C,D,E,F,G,H,I) की व्यवस्थाओं में (A,B,C) लगातार आएं लेकिन वर्णक्रम (A,B,C) में न हों, ऐसी कितनी व्यवस्थाएं हैं?
In arrangements of (A,B,C,D,E,F,G,H,I), how many have (A,B,C) consecutive but not in the order (A,B,C)?
Explanation opens after your attempt
D. (25200)
Concept
Treat the three letters as one block, giving (7!) arrangements, and inside it (3!-1) valid orders. Count the internal arrangements of the block separately.
Why this answer is correct
The correct answer is D. (25200). Treat the three letters as one block, giving (7!) arrangements, and inside it (3!-1) valid orders. Count the internal arrangements of the block separately.
Exam Tip
तीनों अक्षरों को एक खंड मानने पर (7!) व्यवस्थाएं हैं और अंदर (3!-1) मान्य क्रम हैं। खंड की आंतरिक व्यवस्था अलग से गिनें।
Login to save your score, XP, coins and progress.
