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
Correct Answer

B. (64)

Step 1

Concept

One element is fixed to be included and the remaining (6) elements are free. So the number of subsets is \(2^6=64\).

Step 2

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 \(2^6=64\).

Step 3

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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Mathematics Answer, Explanation and Revision Hints

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?

Correct Answer: B. (64). Explanation: एक तत्व को रखना तय है और बाकी (6) तत्व स्वतंत्र हैं। इसलिए उपसमुच्चयों की संख्या \(2^6=64\) होगी। / One element is fixed to be included and the remaining (6) elements are free. So the number of subsets is \(2^6=64\).

Which concept should I revise for this Mathematics MCQ?

One element is fixed to be included and the remaining (6) elements are free. So the number of subsets is \(2^6=64\).

What exam hint can help solve this Mathematics question?

एक तत्व को रखना तय है और बाकी (6) तत्व स्वतंत्र हैं। इसलिए उपसमुच्चयों की संख्या \(2^6=64\) होगी।