(15) सदस्यों में से (6) सदस्यों की समिति बनानी है। एक निश्चित सदस्य अवश्य शामिल हो और दो विशेष सदस्य साथ-साथ शामिल न हों, तो कितनी समितियां बनेंगी?
A committee of (6) members is to be formed from (15) members. One fixed member must be included and two special members must not be included together. How many committees are possible?
Explanation opens after your attempt
B. (1782)
Concept
After fixing the required member, choose (5) from the remaining (14) and subtract cases where both special members are together, \(^{12}C_{3}\). The answer is \(^{14}C_{5}-{}^{12}C_{3}=1782\).
Why this answer is correct
The correct answer is B. (1782). After fixing the required member, choose (5) from the remaining (14) and subtract cases where both special members are together, \(^{12}C_{3}\). The answer is \(^{14}C_{5}-{}^{12}C_{3}=1782\).
Exam Tip
निश्चित सदस्य को शामिल मानकर शेष (14) में से (5) चुनें और दोनों विशेष साथ वाले \(^{12}C_{3}\) घटाएं। उत्तर \(^{14}C_{5}-{}^{12}C_{3}=1782\) है।
Login to save your score, XP, coins and progress.
