(20) विद्यार्थियों में से (6) चुनने हैं। दो विशेष विद्यार्थी में से ठीक एक चुना जाना चाहिए। कितने चयन होंगे?
From (20) students, (6) are to be chosen. Exactly one of two special students must be selected. How many selections are possible?
Explanation opens after your attempt
Correct Answer
C. (18144)
Concept
Choose (1) of the two special students and (5) from the remaining (18). The number is \(^{2}C_{1}{}^{18}C_{5}=17136\).
Why this answer is correct
The correct answer is C. (18144). Choose (1) of the two special students and (5) from the remaining (18). The number is \(^{2}C_{1}{}^{18}C_{5}=17136\).
Exam Tip
दो विशेष में से (1) चुनें और बाकी (5) को (18) में से चुनें। संख्या \(^{2}C_{1}{}^{18}C_{5}=17136\) होती है।
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