यदि \(A=\{p,q,r\}\) है तो (A) के कितने उपसमुच्चय (p) को अवश्य रखते हैं?
If \(A=\{p,q,r\}\) then how many subsets of (A) must contain (p)?
Explanation opens after your attempt
Correct Answer
C. (4)
Concept
The element (p) is fixed and the remaining two elements can be chosen in \(2^2\) ways. In exams fix the compulsory element and count the rest.
Why this answer is correct
The correct answer is C. (4). The element (p) is fixed and the remaining two elements can be chosen in \(2^2\) ways. In exams fix the compulsory element and count the rest.
Exam Tip
(p) निश्चित है और बाकी दो तत्वों को \(2^2\) तरीकों से चुना जा सकता है। परीक्षा में निश्चित तत्व अलग रखकर बाकी पर गिनती करें।
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