(1,2,3,4,5,6,7,8,9) से बिना पुनरावृत्ति कितनी (5)-अंकीय संख्याएं बनेंगी जिनमें अंक (1) और (2) दोनों शामिल हों?

How many (5)-digit numbers can be formed from (1,2,3,4,5,6,7,8,9) without repetition if both digits (1) and (2) are included?

Explanation opens after your attempt
Correct Answer

A. (2520)

Step 1

Concept

Include (1,2), choose (3) more digits from the remaining (7), then arrange the (5) digits in (5!) ways. For compulsory objects, include them first and choose the rest.

Step 2

Why this answer is correct

The correct answer is A. (2520). Include (1,2), choose (3) more digits from the remaining (7), then arrange the (5) digits in (5!) ways. For compulsory objects, include them first and choose the rest.

Step 3

Exam Tip

(1,2) के साथ शेष (7) अंकों में से (3) चुनकर (5!) तरीकों से व्यवस्थित करें। अनिवार्य वस्तुओं को पहले शामिल मानकर बाकी चुनें।

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Mathematics Answer, Explanation and Revision Hints

(1,2,3,4,5,6,7,8,9) से बिना पुनरावृत्ति कितनी (5)-अंकीय संख्याएं बनेंगी जिनमें अंक (1) और (2) दोनों शामिल हों? / How many (5)-digit numbers can be formed from (1,2,3,4,5,6,7,8,9) without repetition if both digits (1) and (2) are included?

Correct Answer: A. (2520). Explanation: (1,2) के साथ शेष (7) अंकों में से (3) चुनकर (5!) तरीकों से व्यवस्थित करें। अनिवार्य वस्तुओं को पहले शामिल मानकर बाकी चुनें। / Include (1,2), choose (3) more digits from the remaining (7), then arrange the (5) digits in (5!) ways. For compulsory objects, include them first and choose the rest.

Which concept should I revise for this Mathematics MCQ?

Include (1,2), choose (3) more digits from the remaining (7), then arrange the (5) digits in (5!) ways. For compulsory objects, include them first and choose the rest.

What exam hint can help solve this Mathematics question?

(1,2) के साथ शेष (7) अंकों में से (3) चुनकर (5!) तरीकों से व्यवस्थित करें। अनिवार्य वस्तुओं को पहले शामिल मानकर बाकी चुनें।