अंकों (1,2,3,4,5,6,7,8) से बिना पुनरावृत्ति (5) अंकों की कितनी संख्याएं बनेंगी जिनमें (1) और (8) साथ-साथ आएं?

How many (5)-digit numbers can be formed from (1,2,3,4,5,6,7,8) without repetition in which (1) and (8) are adjacent?

Explanation opens after your attempt
Correct Answer

B. (1800)

Step 1

Concept

Treat (1) and (8) as a block and choose the other (3) digits from (6). The total is \(\binom{6}{3}\cdot4!\cdot2!=960\).

Step 2

Why this answer is correct

The correct answer is B. (1800). Treat (1) and (8) as a block and choose the other (3) digits from (6). The total is \(\binom{6}{3}\cdot4!\cdot2!=960\).

Step 3

Exam Tip

(1) और (8) को ब्लॉक मानें और बाकी (3) अंक (6) में से चुनें। कुल \(\binom{6}{3}\cdot4!\cdot2!=960\) है।

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Mathematics Answer, Explanation and Revision Hints

अंकों (1,2,3,4,5,6,7,8) से बिना पुनरावृत्ति (5) अंकों की कितनी संख्याएं बनेंगी जिनमें (1) और (8) साथ-साथ आएं? / How many (5)-digit numbers can be formed from (1,2,3,4,5,6,7,8) without repetition in which (1) and (8) are adjacent?

Correct Answer: B. (1800). Explanation: (1) और (8) को ब्लॉक मानें और बाकी (3) अंक (6) में से चुनें। कुल \(\binom{6}{3}\cdot4!\cdot2!=960\) है। / Treat (1) and (8) as a block and choose the other (3) digits from (6). The total is \(\binom{6}{3}\cdot4!\cdot2!=960\).

Which concept should I revise for this Mathematics MCQ?

Treat (1) and (8) as a block and choose the other (3) digits from (6). The total is \(\binom{6}{3}\cdot4!\cdot2!=960\).

What exam hint can help solve this Mathematics question?

(1) और (8) को ब्लॉक मानें और बाकी (3) अंक (6) में से चुनें। कुल \(\binom{6}{3}\cdot4!\cdot2!=960\) है।