Class 11 Mathematics Permutations and Combinations Derivations of formulas and their connections Hard Level 64

यदि (5) boys और (4) girls में से (3) students चुनने हैं और कम से कम (1) girl चाहिए, तो formula derivation का सबसे छोटा route कौन-सा है?

If (3) students are to be chosen from (5) boys and (4) girls with at least (1) girl, what is the shortest formula derivation route?

Explanation opens after your attempt
Correct Answer

A. \(^{9}C_3-^{5}C_3\)

Step 1

Concept

The complement of at least (1) girl is no girl. In exams total minus unwanted is fast for at least conditions.

Step 2

Why this answer is correct

The correct answer is A. \(^{9}C_3-^{5}C_3\). The complement of at least (1) girl is no girl. In exams total minus unwanted is fast for at least conditions.

Step 3

Exam Tip

At least (1) girl का complement no girl है। परीक्षा में at least condition में total minus unwanted तेज होता है।

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यदि (5) boys और (4) girls में से (3) students चुनने हैं और कम से कम (1) girl चाहिए, तो formula derivation का सबसे छोटा route कौन-सा है? / If (3) students are to be chosen from (5) boys and (4) girls with at least (1) girl, what is the shortest formula derivation route?

Correct Answer: A. \(^{9}C_3-^{5}C_3\). Explanation: At least (1) girl का complement no girl है। परीक्षा में at least condition में total minus unwanted तेज होता है। / The complement of at least (1) girl is no girl. In exams total minus unwanted is fast for at least conditions.

Which concept should I revise for this Mathematics MCQ?

The complement of at least (1) girl is no girl. In exams total minus unwanted is fast for at least conditions.

What exam hint can help solve this Mathematics question?

At least (1) girl का complement no girl है। परीक्षा में at least condition में total minus unwanted तेज होता है।