यदि \(A=\{1,2,3,4\}\) है तो कितने उपसमुच्चयों में अवयव (1) अवश्य होगा?
If \(A=\{1,2,3,4\}\) then how many subsets must contain the element (1)?
Explanation opens after your attempt
C. (8)
Concept
Fix (1) and choose freely from the remaining (3) elements. Hence the number is \(2^3=8\).
Why this answer is correct
The correct answer is C. (8). Fix (1) and choose freely from the remaining (3) elements. Hence the number is \(2^3=8\).
Exam Tip
(1) को निश्चित रखकर बाकी (3) अवयव स्वतंत्र रूप से चुने जा सकते हैं। इसलिए संख्या \(2^3=8\) है।
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