कितनी (6)-अंकीय संख्याएं (1,2,3,4,5,6) से बिना पुनरावृत्ति बनेंगी जिनमें (1) और (2) साथ हों?
How many (6)-digit numbers can be formed from (1,2,3,4,5,6) without repetition if (1) and (2) are adjacent?
Explanation opens after your attempt
C. (240)
Concept
Treat (1) and (2) as a block, giving (5!) arrangements and (2!) internal orders. For adjacent digits, the block method is direct.
Why this answer is correct
The correct answer is C. (240). Treat (1) and (2) as a block, giving (5!) arrangements and (2!) internal orders. For adjacent digits, the block method is direct.
Exam Tip
(1) और (2) को खंड मानकर (5!) व्यवस्थाएं और खंड के भीतर (2!) क्रम हैं। साथ वाले अंकों में खंड विधि सीधी होती है।
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