(6) पत्रों को (6) सही लिफाफों में डालते समय ठीक (2) पत्र गलत लिफाफों में जाएं, ऐसे कितने तरीके हैं?

When (6) letters are put into (6) addressed envelopes, how many ways have exactly (2) letters in wrong envelopes?

Explanation opens after your attempt
Correct Answer

C. (15)

Step 1

Concept

Choose the (2) wrong letters in \(^{6}C_2\) ways, and they must swap with each other. For exactly (2) wrong, those two letters interchange.

Step 2

Why this answer is correct

The correct answer is C. (15). Choose the (2) wrong letters in \(^{6}C_2\) ways, and they must swap with each other. For exactly (2) wrong, those two letters interchange.

Step 3

Exam Tip

गलत जाने वाले (2) पत्र \(^{6}C_2\) तरीकों से चुनें और वे आपस में बदलेंगे। ठीक (2) गलत होने पर वही दो पत्र अदला-बदली करते हैं।

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Mathematics Answer, Explanation and Revision Hints

(6) पत्रों को (6) सही लिफाफों में डालते समय ठीक (2) पत्र गलत लिफाफों में जाएं, ऐसे कितने तरीके हैं? / When (6) letters are put into (6) addressed envelopes, how many ways have exactly (2) letters in wrong envelopes?

Correct Answer: C. (15). Explanation: गलत जाने वाले (2) पत्र \(^{6}C_2\) तरीकों से चुनें और वे आपस में बदलेंगे। ठीक (2) गलत होने पर वही दो पत्र अदला-बदली करते हैं। / Choose the (2) wrong letters in \(^{6}C_2\) ways, and they must swap with each other. For exactly (2) wrong, those two letters interchange.

Which concept should I revise for this Mathematics MCQ?

Choose the (2) wrong letters in \(^{6}C_2\) ways, and they must swap with each other. For exactly (2) wrong, those two letters interchange.

What exam hint can help solve this Mathematics question?

गलत जाने वाले (2) पत्र \(^{6}C_2\) तरीकों से चुनें और वे आपस में बदलेंगे। ठीक (2) गलत होने पर वही दो पत्र अदला-बदली करते हैं।