(10) अलग अक्षरों में से (7) अक्षरों की व्यवस्थाएं बनानी हैं, जिनमें दो निश्चित अक्षर शामिल और साथ हों। कितनी व्यवस्थाएं हैं?
Arrangements of (7) letters are to be made from (10) distinct letters, and two specified letters must be included and adjacent. How many arrangements are possible?
Explanation opens after your attempt
C. (80640)
Concept
Treat the two specified letters as one block, choose (5) more letters from the remaining (8), and arrange (6) units. Include the (2!) internal orders of the block.
Why this answer is correct
The correct answer is C. (80640). Treat the two specified letters as one block, choose (5) more letters from the remaining (8), and arrange (6) units. Include the (2!) internal orders of the block.
Exam Tip
दो निश्चित अक्षरों को एक खंड मानें, शेष (8) में से (5) अक्षर चुनें और (6) इकाइयों को सजाएं। खंड के भीतर (2!) क्रम भी जोड़ें।
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