यदि \(A=\{1,2,3,4,5,6,7\}\) है तो ऐसे उपसमुच्चयों की संख्या कितनी है जिनमें (2) और (5) अवश्य हों लेकिन (7) न हो?
If \(A=\{1,2,3,4,5,6,7\}\) then how many subsets contain (2) and (5) necessarily but do not contain (7)?
Explanation opens after your attempt
Correct Answer
C. (16)
Concept
(2) and (5) are fixed and (7) is excluded, while the remaining (4) elements are free. Hence the number is \(2^4=16\).
Why this answer is correct
The correct answer is C. (16). (2) and (5) are fixed and (7) is excluded, while the remaining (4) elements are free. Hence the number is \(2^4=16\).
Exam Tip
(2) और (5) निश्चित हैं तथा (7) हटेगा, बाकी (4) अवयव स्वतंत्र हैं। इसलिए संख्या \(2^4=16\) है।
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