यदि (A) में (5) तत्व हैं, तो (A) के ऐसे कितने उपसमुच्चय होंगे जिनमें एक निश्चित तत्व अवश्य हो?
If (A) has (5) elements, how many subsets of (A) will contain one fixed element?
Explanation opens after your attempt
C. (16)
Concept
After fixing one element, each of the remaining (4) elements may be chosen or not chosen. So the number is \(2^4=16\).
Why this answer is correct
The correct answer is C. (16). After fixing one element, each of the remaining (4) elements may be chosen or not chosen. So the number is \(2^4=16\).
Exam Tip
एक निश्चित तत्व रखने के बाद बाकी (4) तत्व चुने या छोड़े जा सकते हैं। इसलिए संख्या \(2^4=16\) होगी।
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