यदि (5) boys और (4) girls में से (4) member committee में कम से कम (2) girls चाहिए तो सही summation कौन-सा है?
If a (4)-member committee from (5) boys and (4) girls needs at least (2) girls, which summation is correct?
Explanation opens after your attempt
A. \(^{4}C_2{}^{5}C_2+^{4}C_3{}^{5}C_1+^{4}C_4{}^{5}C_0\)
Concept
The number of girls can be (2), (3), or (4), and the cases are added. In exams write valid cases separately in at least questions.
Why this answer is correct
The correct answer is A. \(^{4}C_2{}^{5}C_2+^{4}C_3{}^{5}C_1+^{4}C_4{}^{5}C_0\). The number of girls can be (2), (3), or (4), and the cases are added. In exams write valid cases separately in at least questions.
Exam Tip
Girls की संख्या (2), (3) या (4) हो सकती है और cases जोड़े जाते हैं। परीक्षा में at least वाले प्रश्नों में valid cases अलग लिखें।
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