यदि (A) में (7) तत्व हैं, तो (A) के ऐसे उपसमुच्चय कितने हैं जिनमें एक निश्चित तत्व अवश्य हो?
If (A) has (7) elements, how many subsets of (A) must contain one fixed element?
Explanation opens after your attempt
B. (64)
Concept
One element is fixed to be included and the remaining (6) elements are free. So the number of subsets is \(2^6=64\).
Why this answer is correct
The correct answer is B. (64). One element is fixed to be included and the remaining (6) elements are free. So the number of subsets is \(2^6=64\).
Exam Tip
एक तत्व को रखना तय है और बाकी (6) तत्व स्वतंत्र हैं। इसलिए उपसमुच्चयों की संख्या \(2^6=64\) होगी।
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