कितने (3)-तत्व उपसमुच्चय \(A=\{1,2,3,4,5,6,7\}\) से बनाए जा सकते हैं जिनमें (1) शामिल हो?
How many (3)-element subsets can be formed from \(A=\{1,2,3,4,5,6,7\}\) that contain (1)?
Explanation opens after your attempt
Correct Answer
C. (15)
Concept
The element (1) is already chosen so the remaining (2) elements are chosen from (6). The number of ways is \(\binom{6}{2}=15\).
Why this answer is correct
The correct answer is C. (15). The element (1) is already chosen so the remaining (2) elements are chosen from (6). The number of ways is \(\binom{6}{2}=15\).
Exam Tip
(1) पहले से चुना है इसलिए बाकी (2) तत्व (6) में से चुने जाएंगे। तरीकों की संख्या \(\binom{6}{2}=15\) है।
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