(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
Correct Answer

C. (80640)

Step 1

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.

Step 2

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.

Step 3

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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Mathematics Answer, Explanation and Revision Hints

(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?

Correct Answer: C. (80640). Explanation: 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। / 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.

Which concept should I revise for this Mathematics MCQ?

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.

What exam hint can help solve this Mathematics question?

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।