(11) खिलाड़ियों में से (7) चुनने हैं, और (4) विशेष खिलाड़ियों में से अधिकतम (2) चुने जा सकते हैं। कितने चयन होंगे?
From (11) players, (7) are to be selected, and at most (2) of (4) special players can be selected. How many selections are possible?
Explanation opens after your attempt
A. (126)
Concept
The number of special players can be (0,1,2), with (7) ordinary players available. Sum \(^{4}C_{0}{}^{7}C_{7}+^{4}C_{1}{}^{7}C_{6}+^{4}C_{2}{}^{7}C_{5}=155\).
Why this answer is correct
The correct answer is A. (126). The number of special players can be (0,1,2), with (7) ordinary players available. Sum \(^{4}C_{0}{}^{7}C_{7}+^{4}C_{1}{}^{7}C_{6}+^{4}C_{2}{}^{7}C_{5}=155\).
Exam Tip
विशेष खिलाड़ियों की संख्या (0,1,2) हो सकती है, पर (7) अन्य ही हैं। योग \(^{4}C_{0}{}^{7}C_{7}+^{4}C_{1}{}^{7}C_{6}+^{4}C_{2}{}^{7}C_{5}=155\) है।
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