Class 11 Mathematics Permutations and Combinations Derivations of formulas and their connections Expert Level 66

(7) letters और envelopes में exactly (2) letters सही envelope में जाएं, तो count क्या होगा?

With (7) letters and envelopes, if exactly (2) letters go into correct envelopes, what is the count?

Author: Muft Shiksha Editorial Team Published:
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Correct Answer

A. \(^{7}C_2D_5\)

Step 1

Concept

Choose the correct letters and derange the remaining letters into wrong envelopes. In exams solve exactly correct letters using the fixed-point formula.

Step 2

Why this answer is correct

The correct answer is A. \(^{7}C_2D_5\). Choose the correct letters and derange the remaining letters into wrong envelopes. In exams solve exactly correct letters using the fixed-point formula.

Step 3

Exam Tip

सही letters चुनें और बाकी letters को wrong envelopes में derange करें। परीक्षा में exactly correct letters को fixed-point formula से करें।

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(7) letters और envelopes में exactly (2) letters सही envelope में जाएं, तो count क्या होगा? / With (7) letters and envelopes, if exactly (2) letters go into correct envelopes, what is the count?

Correct Answer: A. \(^{7}C_2D_5\). Explanation: सही letters चुनें और बाकी letters को wrong envelopes में derange करें। परीक्षा में exactly correct letters को fixed-point formula से करें। / Choose the correct letters and derange the remaining letters into wrong envelopes. In exams solve exactly correct letters using the fixed-point formula.

Which concept should I revise for this Mathematics MCQ?

Choose the correct letters and derange the remaining letters into wrong envelopes. In exams solve exactly correct letters using the fixed-point formula.

What exam hint can help solve this Mathematics question?

सही letters चुनें और बाकी letters को wrong envelopes में derange करें। परीक्षा में exactly correct letters को fixed-point formula से करें।