Class 11 Mathematics Permutations and Combinations Derivations of formulas and their connections Hard Level 65

(9) people में से (5) चुनने हैं और दो particular people साथ-साथ चयनित नहीं हो सकते। Count कौन-सी है?

Choose (5) people from (9) people, but two particular people cannot be selected together. What is the count?

Explanation opens after your attempt
Correct Answer

A. \(^{9}C_5-{}^{7}C_3\)

Step 1

Concept

Subtract selections containing both particular people from total selections. In exams solve not-together selection using complement.

Step 2

Why this answer is correct

The correct answer is A. \(^{9}C_5-{}^{7}C_3\). Subtract selections containing both particular people from total selections. In exams solve not-together selection using complement.

Step 3

Exam Tip

Total selections से दोनों particular people वाले selections घटाएं। परीक्षा में not together in selection को complement से हल करें।

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(9) people में से (5) चुनने हैं और दो particular people साथ-साथ चयनित नहीं हो सकते। Count कौन-सी है? / Choose (5) people from (9) people, but two particular people cannot be selected together. What is the count?

Correct Answer: A. \(^{9}C_5-{}^{7}C_3\). Explanation: Total selections से दोनों particular people वाले selections घटाएं। परीक्षा में not together in selection को complement से हल करें। / Subtract selections containing both particular people from total selections. In exams solve not-together selection using complement.

Which concept should I revise for this Mathematics MCQ?

Subtract selections containing both particular people from total selections. In exams solve not-together selection using complement.

What exam hint can help solve this Mathematics question?

Total selections से दोनों particular people वाले selections घटाएं। परीक्षा में not together in selection को complement से हल करें।